2023 in reptile paleontology

• Redescription of Palaeogekko risgoviensis is published by Villa (2023), who confirms the validity of this species as a distinct taxon, and interprets it as a non-eublepharid gekkonoid of uncertain affinities.{{Cite journal|last=Villa |first=A. |year=2023 |title=A redescription of Palaeogekko risgoviensis (Squamata, Gekkota) from the Middle Miocene of Germany, with new data on its morphology |journal=PeerJ |volume=11 |at=e14717 |doi=10.7717/peerj.14717 |pmid=36655047 |pmc=9841909 |doi-access=free}}
• Thorn et al. (2023) describe new fossil material of Aethesia frangens from the Pleistocene of Australia, interpret it as a large-bodied (approximately 2.4 kg) blue-tongued skink, and transfer it to the genus Tiliqua.{{cite journal |last1=Thorn |first1=K. M. |last2=Fusco |first2=D. A. |last3=Hutchinson |first3=M. N. |last4=Gardner |first4=M. G. |last5=Clayton |first5=J. L. |last6=Prideaux |first6=G. J. |last7=Lee |first7=M. S. Y. |year=2023 |title=A giant armoured skink from Australia expands lizard morphospace and the scope of the Pleistocene extinctions |journal=Proceedings of the Royal Society B: Biological Sciences |volume=290 |issue=2000 |at=20230704 |doi=10.1098/rspb.2023.0704 |pmid=37312544 |pmc=10265006 }}
• Lacertid, blanid and anguid fossil material, including one of the oldest records of the genus Blanus reported to date, is described from the Early Miocene localities Montaigu-le-Blin and Crémat (France) by Čerňanský (2023), expanding known spatial and temporal distribution of Blanus cf. gracilis during the Early Miocene.{{cite journal |last=Čerňanský |first=A. |year=2023 |title=New lizard material from two Early Miocene localities in France: Montaigu-le-Blin (MN 2) and Crémat (MN 3) |journal=Geobios |volume=80 |pages=15–28 |doi=10.1016/j.geobios.2023.06.007|bibcode=2023Geobi..80...15C }}
• Redescription of Uquiasaurus heptanodonta is published by Scanferla & Díaz-Fernández (2023), who interpret the type series of this species as a fossil bone assemblage composed by more than one species of Liolaemus, extending known fossil record of the latter genus.{{Cite journal|last1=Scanferla |first1=A. |last2=Díaz-Fernández |first2=L. |title=Reassessment of Uquiasaurus heptanodonta, an iguanian lizard from the late Pliocene (Uquía Formation) of NW Argentina |year=2023 |journal=Ameghiniana |volume=60 |issue=6 |pages=535–539 |doi=10.5710/AMGH.01.09.2023.3577 |s2cid=261523182}}
• Hamilton et al. (2023) report the discovery of the fossil material of cf. Palaeosaniwa canadensis from the Campanian Wapiti Formation (Alberta, Canada), representing the northernmost definitive occurrence of Monstersauria in the Upper Cretaceous of North America reported to date.{{Cite journal|last1=Hamilton |first1=S. M. |last2=Paparella |first2=I. |last3=Bell |first3=P. R. |last4=Campione |first4=N. E. |last5=Fanti |first5=F. |last6=Larson |first6=D. W. |last7=Sissons |first7=R. L. |last8=Vavrek |first8=M. J. |last9=Balsai |first9=M. J. |last10=Sullivan |first10=C. |title=New Lizard Specimens from the Campanian Wapiti Formation of Alberta, Canada |year=2023 |journal=Geosciences |volume=13 |issue=11 |at=337 |doi=10.3390/geosciences13110337 |doi-access=free|bibcode=2023Geosc..13..337H |hdl=11585/954542 |hdl-access=free }}
• Loréal et al. (2023) describe new fossil material of Pseudopus pannonicus from the Neogene localities across Moldova, Russia and Ukraine, including fossils from the Turolian localities Gaverdovsky and Volchaya Balka in North Caucasus representing the easternmost or some of the easternmost known occurrences of this species, and revise the diagnostic features of P. pannonicus.{{Cite journal|last1=Loréal |first1=E. |last2=Syromyatnikova |first2=E. V. |last3=Danilov |first3=I. G. |last4=Čerňanský |first4=A. |year=2023 |title=The easternmost record of the largest anguine lizard that has ever lived – Pseudopus pannonicus (Squamata, Anguidae): new fossils from the late Neogene of Eastern Europe |journal=Fossil Record |volume=26 |issue=1 |pages=51–84 |doi=10.3897/fr.26.100059 |s2cid=257288946 |doi-access=free}}
• Georgalis, Mennecart & Smith (2023) describe two teeth of a probable member of the genus Varanus from the Miocene deposits from the Hüenerbach locality (Switzerland), representing of the oldest occurrences of the genus from Europe.{{Cite journal |last1=Georgalis |first1=G. L. |last2=Mennecart |first2=B. |last3=Smith |first3=K. T. |year=2023 |title=First fossil record of Varanus (Reptilia, Squamata) from Switzerland and the earliest occurrences of the genus in Europe |journal=Swiss Journal of Geosciences |volume=116 |issue=1 |at=9 |doi=10.1186/s00015-023-00440-5 |doi-access=free}}
• A specimen of the ammonite Mammites nodosoides, preserved with bite traces interpreted as most likely resulting from a lethal attack of a mosasaur directed at the apertural part of the ammonite with the head and arm crown, is described from the Turonian Bílá Hora Formation (Czech Republic) by Mazuch et al. (2023).{{Cite journal|last1=Mazuch |first1=M. |last2=Košťák |first2=M. |last3=Mikuláš |first3=R. |last4=Culka |first4=A. |last5=Kohout |first5=O. |last6=Jagt |first6=J. W. M. |year=2023 |title=Bite traces of a large, mosasaur-type(?) vertebrate predator in the lower Turonian ammonite Mammites nodosoides (Schlüter, 1871) from the Czech Republic |journal=Cretaceous Research |volume=153 |at=105714 |doi=10.1016/j.cretres.2023.105714}}
• Evidence from tooth microwear of mosasaurs from the type area for the Maastrichtian, interpreted as indicative of preferences for vertebrate and/or invertebrate prey in different mosasaur taxa but not indicative of strict dietary partitioning, is presented by Holwerda et al. (2023).{{Cite journal |last1=Holwerda |first1=F. M. |last2=Bestwick |first2=J. |last3=Purnell |first3=M. A. |last4=Jagt |first4=J. W. M. |last5=Schulp |first5=A. S. |year=2023 |title=Three-dimensional dental microwear in type-Maastrichtian mosasaur teeth (Reptilia, Squamata) |journal=Scientific Reports |volume=13 |issue=1 |at=18720 |doi=10.1038/s41598-023-42369-7 |pmid=37945619 |pmc=10636054 |doi-access=free|bibcode=2023NatSR..1318720H }}
• A humerus of a mosasaurine related to Plotosaurus beninsoni and members of the genus Mosasaurus is described from the Maastrichtian Lopez de Bertodano Formation (Antarctica) by O'Gorman et al. (2023), expanding known diversity of Antarctic mosasaurines.{{Cite journal|last1=O'Gorman |first1=J. P. |last2=Bona |first2=P. |last3=Canale |first3=J. I. |last4=Tineo |first4=D. E. |last5=Fernández |first5=M. S. |last6=Cárdenas |first6=M. |last7=Reguero |first7=M. |title=A new mosasaurine specimen (Squamata, Mosasauridae) from the Upper Cretaceous of Antarctica with comments on the Weddellian diversity of Mosasaurinae |year=2023 |journal=Alcheringa: An Australasian Journal of Palaeontology |volume=47 |issue=2 |pages=211–220 |doi=10.1080/03115518.2023.2203739 |bibcode=2023Alch...47..211O |s2cid=258691668}}
• LeBlanc et al. (2023) report that tooth replacement in extant snakes occurs by resorption of dentine by odontoclasts from within the pulp of the tooth, and that this mechanism was already present in Yurlunggur and Portugalophis.{{cite journal |last1=LeBlanc |first1=A. R. H. |last2=Palci |first2=A. |last3=Anthwal |first3=N. |last4=Tucker |first4=A. S. |last5=Araújo |first5=R. |last6=Pereira |first6=M. F. C. |last7=Caldwell |first7=M. W. |year=2023 |title=A conserved tooth resorption mechanism in modern and fossil snakes |journal=Nature Communications |volume=14 |issue=1 |at=742 |doi=10.1038/s41467-023-36422-2 |pmid=36765054 |pmc=9918488 |bibcode=2023NatCo..14..742L | doi-access = free}}
• A study on the evolution of the snake brain, based on data from extant and fossil taxa, is published by Macrì et al. (2023), who interpret their findings as indicative of a burrowing lifestyle with opportunistic behavior at the origin of the crown group of snakes.{{Cite journal|last1=Macrì |first1=S. |last2=Aalto |first2=I.-M. |last3=Allemand |first3=R. |last4=Di-Poï |first4=N. |year=2023 |title=Reconstructing the origin and early evolution of the snake brain |journal=Science Advances |volume=9 |issue=39 |at=eadi6888 |doi=10.1126/sciadv.adi6888 |pmid=37756406 |pmc=10530081 | doi-access = free|bibcode=2023SciA....9I6888M }}
• A palaeophiid vertebra tentatively referred to the genus Pterosphenus is described from the Eocene Ameki Formation (Nigeria) by Georgalis (2023), expanding known diversity of palaeophiids from Nigeria.{{Cite journal|last=Georgalis |first=G. L. |title=First potential occurrence of the large aquatic snake Pterosphenus (Serpentes, Palaeophiidae) from Nigeria, with further documentation of Pterosphenus schweinfurthi from Egypt |year=2023 |journal=Alcheringa: An Australasian Journal of Palaeontology |volume=47 |issue=3 |pages=327–335 |doi=10.1080/03115518.2023.2217874 |bibcode=2023Alch...47..327G |s2cid=259422068}}
• Averianov (2023) describes new fossil material of Pterosphenus muruntau from the Eocene (Bartonian) deposits from the Dzheroi 2 locality in the Central Kyzylkum Desert (Uzbekistan), and considers P. muruntau to be a valid species.{{Cite journal|last=Averianov |first=A. O. |year=2023 |title=Pterosphenus muruntau – valid species of sea snakes (Squamata: Palaeophiidae) from the middle Eocene of Uzbekistan |journal=Zoosystematica Rossica |volume=32 |issue=1 |pages=85–92 |doi=10.31610/zsr/2023.32.1.85 |s2cid=259456317}}
• Alfonso-Rojas et al. (2023) describe new fossil material of Colombophis from the Miocene La Victoria and Villavieja formations (Colombia), and interpret its anatomy as supporting the placement of Colombophis among the alethinophidians.{{Cite journal |last1=Alfonso-Rojas |first1=A. |last2=Vanegas |first2=R. D. |last3=Mariño-Morejón |first3=E. |last4=Cadena |first4=E.-A. |year=2023 |title=Newly discovered fossils provide novel insights on the biology of the South American Miocene snake Colombophis Hoffstetter & Rage, 1977 |journal=Geodiversitas |volume=45 |issue=13 |pages=377–399 |doi=10.5252/geodiversitas2023v45a13 |s2cid=259975515 |url=https://sciencepress.mnhn.fr/en/periodiques/geodiversitas/45/13 |doi-access=free}}
• Shi et al. (2023) describe an assemblage of early Pliocene snake fossils entombed with the mammalian fauna from Houxushan (Queshan, Henan, China), and interpret the studied fossils as indicative of a warmer and more humid climate in this region during the early Pliocene.{{Cite journal|last1=Shi |first1=J. |last2=Wang |first2=Y. |last3=Messenger |first3=K. R. |last4=Jiangzuo |first4=Q. |last5=Chen |first5=Y. |last6=Jin |first6=C. |year=2023 |title=Early Pliocene fossil snakes (Squamata, Colubroidea) with various teeth from the fissure deposit from Queshan, Henan, China |journal=Historical Biology: An International Journal of Paleobiology |doi=10.1080/08912963.2022.2161382 |s2cid=255649762}}
• Bolet (2023) describes an assemblage of squamate fossils from the Eocene locality of Mazaterón (Spain), providing evidence of the persistence of glyptosaur and anguine anguids, iguanids and lacertids through most of the Iberian Eocene, and including one of the oldest records of amphisbaenians in Europe after the apparent gap in their European fossil record in the MP11–MP15 interval.{{Cite journal|last=Bolet |first=A. |year=2023 |title=Lizards and amphisbaenians (Reptilia, Squamata) from the middle Eocene of Mazaterón (Soria, Spain) |journal=The Anatomical Record |doi=10.1002/ar.25271 |pmid=37283299 |s2cid=259097435 |doi-access=free}}
• Lofgren et al. (2023) describe new fossil material of squamates from the Uintan, Chadronian and Whitneyan strata in Montana (United States), including the first records of varanids, Calamagras and a possible member of the genus Peltosaurus from the Tertiary depositional basins of southwest Montana, and the first record of Aciprion formosum from the state and from the Whitneyan strata.{{Cite journal|last1=Lofgren |first1=D. |last2=Hanneman |first2=D. |last3=Runkel |first3=A. |last4=Fong |first4=P. |last5=Hong |first5=G. |last6=Burdekin |first6=J. |last7=Chai |first7=M. |last8=Kan |first8=Y. |last9=Jorgensen |first9=B. |title=New records of Eocene and Oligocene squamates from southwest Montana |journal=Paludicola |year=2023 |volume=14 |issue=3 |pages=110–121 }}
• Georgalis et al. (2023) describe fossil material of lizards and snakes from the Miocene localities in Anatolia (Turkey), including fossil remains tentatively referred to chameleons, potentially representing the oldest occurrences of chameleons from Asia reported to date.{{Cite journal |last1=Georgalis |first1=G. L. |last2=Čerňanský |first2=A. |last3=Göktaş |first3=F. |last4=Alpagut |first4=B. |last5=Şarbak |first5=A. |last6=Mayda |first6=S. |year=2023 |title=The antiquity of Asian chameleons—first potential Chamaeleonidae and associated squamate fauna from the Lower and Middle Miocene of Anatolia |journal=Journal of Vertebrate Paleontology |volume=42 |issue=2 |at=e2160644 |doi=10.1080/02724634.2022.2160644 |s2cid=256349649}}

• A study on the skull morphology of Hupehsuchus nanchangensis, based on data from new specimens from the Lower Triassic Jialingjiang Formation (China), is published by Fang et al. (2023), who find the shape of the skull roof and snout of H. nanchangensis to be highly convergent with modern baleen whales, and interpret Hupehsuchus as likely employing continuous ram filter feeding as in extant bowhead and right whales.{{Cite journal|last1=Fang |first1=Z.-C. |last2=Li |first2=J.-L. |last3=Yan |first3=C.-B. |last4=Zou |first4=Y.-R. |last5=Tian |first5=L. |last6=Zhao |first6=B. |last7=Benton |first7=M. J. |last8=Cheng |first8=L. |last9=Lai |first9=X.-L. |year=2023 |title=First filter feeding in the Early Triassic: cranial morphological convergence between Hupehsuchus and baleen whales |journal=BMC Ecology and Evolution |volume=23 |issue=1 |at=36 |doi=10.1186/s12862-023-02143-9 |pmid=37550649 |pmc=10408079 |doi-access=free}}
• Kear et al. (2023) describe ichthyopterygian fossil material (including 11 vertebral centra which are substantially larger than those of typical basal ichthyosauriforms) from the Lower Triassic Vikinghøgda Formation (Svalbard, Norway), interpreting the internal structure of the studied bones as indicating that they belonged to a fully pelagic animal, and argue that ichthyosauromorphs might have originated before the Permian–Triassic extinction event.{{cite journal|last1=Kear |first1=B. P. |last2=Engelschiøn |first2=V. S. |last3=Hammer |first3=Ø. |last4=Roberts |first4=A. J. |last5=Hurum |first5=J. H. |year=2023 |title=Earliest Triassic ichthyosaur fossils push back oceanic reptile origins |journal=Current Biology |volume=33 |issue=5 |pages=R178–R179 |doi=10.1016/j.cub.2022.12.053 |pmid=36917937 |s2cid=257498390 |doi-access=free|bibcode=2023CBio...33R.178K }}
• Engelschiøn et al. (2023) use radiography and computed tomography to reveal taxonomically significant details of the skeletal anatomy of a mixosaurid specimen from the Middle Triassic Botneheia Formation (Svalbard, Norway), and interpret it as a member of the genus Phalarodon with affinities to P. atavus.{{Cite journal|last1=Engelschiøn |first1=V. S. |last2=Roberts |first2=A. J. |last3=With |first3=R. |last4=Hammer |first4=Ø. |title=Exceptional X-Ray contrast: Radiography imaging of a Middle Triassic mixosaurid from Svalbard |year=2023 |journal=PLOS ONE |volume=18 |issue=5 |at=e0285939 |doi=10.1371/journal.pone.0285939 |doi-access=free |pmid=37256843 |pmc=10231774 |bibcode=2023PLoSO..1885939E}}
• A study on three gravid Mixosaurus specimens from the Middle Triassic Besano Formation at the Monte San Giorgio locality at the Swiss-Italian border is published by Miedema et al. (2023), who report that two of the studied specimens were preserved with fetuses with tail-first birth position while the third specimen was preserved with fetuses with head-first birth position, propose that a slight preference for tail-first birth likely arose at the base of the Merriamosauria, and argue that fetal orientation at birth in ichthyosaurs was more likely to be related to expulsion mechanics during birth or to maternal stress induced from the fetal orientation during pregnancy than to the need for reduction of asphyxiation risk.{{Cite journal |last1=Miedema |first1=F. |last2=Klein |first2=N. |last3=Blackburn |first3=D. G. |last4=Sander |first4=P. M. |last5=Maxwell |first5=E. E. |last6=Griebeler |first6=E. M. |last7=Scheyer |first7=T. M. |year=2023 |title=Heads or tails first? Evolution of fetal orientation in ichthyosaurs, with a scrutiny of the prevailing hypothesis |journal=BMC Ecology and Evolution |volume=23 |issue=1 |at=12 |doi=10.1186/s12862-023-02110-4 |pmid=37072698 |pmc=10114408 |doi-access=free}}
• A study on the cranial ontogeny of Mixosaurus cornalianus, providing evidence of developmental patterns in the early ontogenetic stages that were reminiscent of the probable ancestral reptile condition, is published by Miedema et al. (2023).{{Cite journal|last1=Miedema |first1=F. |last2=Bindellini |first2=G. |last3=Dal Sasso |first3=C. |last4=Scheyer |first4=T. M. |last5=Maxwell |first5=E. E. |year=2023 |title=Ontogenetic variation in the cranium of Mixosaurus cornalianus, with implications for the evolution of ichthyosaurian cranial development |journal=Swiss Journal of Palaeontology |volume=142 |issue=1 |at=27 |doi=10.1186/s13358-023-00289-z |pmid=37810205 |pmc=10556136 |doi-access=free|bibcode=2023SwJP..142...27M }}
• A study on the ecomorphological variation of skulls and teeth of members of the genus Temnodontosaurus, providing evidence of a range of configurations allowing prey to be captured and processed in different ways by members of different species and possibly indicative of niche partitioning, is published by Bennion et al. (2023).{{Cite journal|last1=Bennion |first1=R. F. |last2=Maxwell|first2=E. E. |last3=Lambert |first3=O. |last4=Fischer |first4=V. |year=2023 |title=Craniodental ecomorphology of the large Jurassic ichthyosaurian Temnodontosaurus |journal=Journal of Anatomy |volume=244 |issue=1 |pages=22–41 |doi=10.1111/joa.13939 |pmid=37591692 |pmc=10734653 |pmc-embargo-date=August 17, 2025 |s2cid=260969287}}
• Redescription of the holotypes of Grendelius pseudoscythicus and G. zhuravlevi is published by Zverkov, Arkhangelsky & Stenshin (2023), who consider both species to be valid, indicating the presence of at least three species of Grendelius in the Middle Russian Sea during the latest Jurassic, and argue that there is insufficient evidence for synonymy between the genera Brachypterygius and Grendelius.{{cite journal|last1=Zverkov |first1=N. G. |last2=Arkhangelsky |first2=M. S. |last3=Stenshin |first3=I. M. |year=2023 |title=New Data on Late Jurassic Ichthyosaurs of the Genus Grendelius from European Russia |journal=Paleontological Journal |volume=56 |issue=11 |pages=1459–1481 |doi=10.1134/S003103012211020X |s2cid=256618348}}
• Delsett et al. (2023) compare the ossified hyoid elements in ophthalmosaurid ichthyosaurs and toothed whales, and report that, based on hyoid shape, suction feeding seems to never have evolved in ichthyosaurs.{{cite journal|last1=Delsett |first1=L. L. |last2=Pyenson |first2=N. |last3=Miedema |first3=F. |last4=Hammer |first4=Ø. |year=2023 |title=Is the hyoid a constraint on innovation? A study in convergence driving feeding in fish-shaped marine tetrapods |journal=Paleobiology |volume=49 |issue=4 |pages=684–699 |doi=10.1017/pab.2023.12 |s2cid=258087360 |doi-access=free|bibcode=2023Pbio...49..684D |hdl=10852/106844 |hdl-access=free }}
• Reassessment of the history and identity of the ichthyosaur specimens from the Posidonia Shale housed in the Paleontological Collection of Tübingen University is published by Stöhr & Werneburg (2023).{{Cite journal|last1=Stöhr |first1=H. |last2=Werneburg |first2=I. |title=The Tübingen collection of ichthyosaurs from the Lower Jurassic (Lower Toarcian) Posidonienschiefer Formation of Württemberg: a historical and curatorial perspective |year=2023 |journal=Palaeodiversity |volume=16 |issue=1 |pages=39–97 |doi=10.18476/pale.v16.a3 |s2cid=258383828 |doi-access=free}}
• Motani & Shimada (2023) providence evidence that derived ichthyosaurs, modern whales, tunas and lamnid sharks share characteristics of caudal vertebrae related to the mechanics of thunniform swimming, and allowing identifications of thunniform swimmers in the fossil record.{{Cite journal |last1=Motani |first1=R. |last2=Shimada |first2=K. |year=2023 |title=Skeletal convergence in thunniform sharks, ichthyosaurs, whales, and tunas, and its possible ecological links through the marine ecosystem evolution |journal=Scientific Reports |volume=13 |issue=1 |at=16664 |doi=10.1038/s41598-023-41812-z |pmid=37794094 |pmc=10550938 |doi-access=free|bibcode=2023NatSR..1316664M }}

• A study on the ecomorphological diversification of Middle Triassic eosauropterygians, providing evidence of evolution of anatomically diverse skulls and teeth (likely related to different feeding specializations of pachypleurosauroids, nothosauroids and pistosauroids) and more homogeneous postcranial skeletons, as well as evidence of regional variations in morphological diversity, is published by Laboury et al. (2023).{{Cite journal|last1=Laboury |first1=A. |last2=Scheyer |first2=T. M. |last3=Klein |first3=N. |last4=Stubbs |first4=T. L. |last5=Fischer |first5=V. |year=2023 |title=High phenotypic plasticity at the dawn of the eosauropterygian radiation |journal=PeerJ |volume=11 |at=e15776 |doi=10.7717/peerj.15776 |pmid=37671356 |pmc=10476616 |doi-access=free}}
• An aggregation of bones of at least three individuals of Keichousaurus hui, interpreted as a likely regurgitalith probably produced by a near-shore sauropterygian such as Nothosaurus or Lariosaurus, is described from the Middle Triassic Xingyi Fauna (Guizhou, China) by Ye, Sun & Yao (2023).{{Cite journal|last1=Ye |first1=X.-J. |last2=Sun |first2=Z.-Y. |last3=Yao |first3=M.-T. |year=2023 |title=A Keichousaurus-bearing regurgitalite from the Middle Triassic Xingyi Fauna, Dingxiao of Xingyi City, Guizhou, South China |journal=Palaeoworld |volume=33 |issue=2 |pages=363–373 |doi=10.1016/j.palwor.2023.03.009 |s2cid=257906301}}
• Li et al. (2023) report preservation of the digestive tract with food remains in specimens of Keichousaurus hui from the Zhuganpo Member of the Falang Formation (China), and reconstruct the internal distribution and organ composition of the digestive tract of K. hui.{{cite journal |last1=Li |first1=J. |last2=Lehrmann |first2=D. J. |last3=Luo |first3=Y. |last4=Adams |first4=T. L. |last5=Yu |first5=M. |last6=Liao |first6=J. |last7=Qin |first7=Y. |last8=Li |first8=Y. |last9=Wang |first9=Y. |year=2023 |title=Soft tissue preservation in the Triassic pachypleurosaur Keichousaurus hui: evidence for digestive tract anatomy, diet, and feeding behavior |journal=Frontiers in Ecology and Evolution |volume=11 |at=1186354 |doi=10.3389/fevo.2023.1186354 |doi-access=free}}
• Morphological and histological evidence interpreted as indicative of puberty as one of the four life stages is reported in the fossil material of Keichousaurus by Li et al. (2023).{{cite journal |last1=Li |first1=Q. |last2=Liu |first2=J. |last3=Klein |first3=N. |last4=Nakajima |first4=Y. |last5=Sander |first5=P. M. |year=2023 |title=Puberty in a Mesozoic reptile |journal=Current Biology |volume=33 |issue=14 |pages=3011–3016.e3 |doi=10.1016/j.cub.2023.05.073 |pmid=37352853 |bibcode=2023CBio...33E3011L |s2cid=259226719|hdl=20.500.11811/11342 |hdl-access=free }}
• New specimen of Yunguisaurus, providing new information on the anatomy of the skull in this taxon, is described from the Ladinian Zhuganpo Member of the Falang Formation (China) by Lu et al. (2023).{{Cite journal|last1=Lu |first1=H. |last2=Zhou |first2=M. |last3=Fu |first3=W. |last4=Chai |first4=J. |title=The cranial characters of a new specimen of Yunguisaurus from Middle Triassic Ladinian Xingyi fauna, Guizhou |year=2023 |journal=Geological Bulletin of China |volume=42 |issue=10 |pages=1696–1705 |doi=10.12097/j.issn.1671-2552.2023.10.007}}
• Reassessment of Trematospondylus macrocephalus is published by Sachs et al. (2023), who interpret the taxon as a dubious rhomaleosaurid.{{Cite journal |last1=Sachs |first1=Sven |last2=Abel |first2=Pascal |last3=Madzia |first3=Daniel |date=2023-05-22 |title=A 'long-forgotten' plesiosaur provides evidence of large-bodied rhomaleosaurids in the Middle Jurassic of Germany |url=https://www.tandfonline.com/doi/full/10.1080/02724634.2023.2205456 |journal=Journal of Vertebrate Paleontology |volume=42 |issue=5 |at=e2205456 |doi=10.1080/02724634.2023.2205456 |s2cid=258848564 |issn=0272-4634}}
• Teeth of freshwater pliosauroids, possibly representing a transitional taxon between the Middle Jurassic and Late Jurassic pliosaurids, are described from the Middle Jurassic Xintiangou Formation (China) by Ma et al. (2023).{{Cite journal|last1=Ma |first1=Q. |last2=Li |first2=N. |last3=Lin |first3=Y. |last4=Xiong |first4=C. |last5=Wei |first5=X. |year=2023 |title=Isolated freshwater pliosaurid teeth from the Middle Jurassic Xintiangou Formation of Chongqing, China |journal=Historical Biology: An International Journal of Paleobiology |volume=36 |issue=12 |pages=2577–2586 |doi=10.1080/08912963.2023.2268617}}
• Vertebrae belonging to a pliosaurid estimated as being 9.8 to 14.4 m in length are described from the Kimmeridgian Kimmeridge Clay (United Kingdom) by Martill et al. (2023).{{cite journal|last1=Martill|first1=David M.|last2=Jacobs|first2=Megan L.|last3=Smith|first3=Roy E.|title=A truly gigantic pliosaur (Reptilia, Sauropterygia) from the Kimmeridge Clay Formation (Upper Jurassic, Kimmeridgian) of England|journal=Proceedings of the Geologists' Association|year=2023|volume=134|issue=3|pages=361–373|doi=10.1016/j.pgeola.2023.04.005|bibcode=2023PrGA..134..361M |s2cid=258630597 |doi-access=free}}
• Fossil material of pliosaurids, including two specimens whose skull size approached that of Megacephalosaurus, is described from the Cenomanian and Turonian of the Yezo Group (Hokkaido, Japan) by Sato et al. (2023).{{Cite journal|last1=Sato |first1=T. |last2=Nagai |first2=K. |last3=Echizenya |first3=H. |last4=Shinmura |first4=T. |last5=Hikida |first5=Y. |last6=Soeda |first6=Y. |year=2023 |title=Pliosaurid (Reptilia: Sauropterygia) remains from the Upper Cretaceous of Japan, and their biostratigraphic and paleogeographic significance |journal=Cretaceous Research |volume=150 |at=105593 |doi=10.1016/j.cretres.2023.105593 |bibcode=2023CrRes.15005593S |doi-access=free}}
• A study on the skeletal anatomy and phylogenetic relationships of Luskhan itilensis is published by Fischer et al. (2023).{{Cite journal|last1=Fischer |first1=V. |last2=Benson |first2=R. B. J. |last3=Zverkov |first3=N. G. |last4=Arkhangelsky |first4=M. S. |last5=Stenshin |first5=I. M. |last6=Uspensky |first6=G. N. |last7=Prilepskaya |first7=N. E. |year=2023 |title=Anatomy and relationships of the bizarre Early Cretaceous pliosaurid Luskhan itilensis |journal=Zoological Journal of the Linnean Society |volume=198 |issue=1 |pages=220–256 |doi=10.1093/zoolinnean/zlac108}}
• Redescription of "Plesiosaurus" bavaricus and description of the fossil material of a member of the same or related species from the Posidonia Shale (Germany) is published by Sachs, Abel & Madzia (2023), who interpret the studied fossils as indicative of the presence of a distinct plesiosaur taxon in the upper Lower Jurassic of the Posidonia Shale of Germany.{{Cite journal|last1=Sachs |first1=S. |last2=Abel |first2=P. |last3=Madzia |first3=D. |year=2023 |title=Unusual plesiosaur vertebrae from the Lower Jurassic Posidonia Shale of Germany |journal=Historical Biology: An International Journal of Paleobiology |volume=36 |issue=10 |pages=2124–2132 |doi=10.1080/08912963.2023.2242376 |s2cid=260994061}}
• D'Angelo et al. (2023) describe a mature elasmosaurid specimen from the Maastrichtian Calafate Formation (Argentina), with histological features of the phalanx and vertebral apophysis otherwise found in juvenile individuals, and interpret this finding as contradicting the hypotheses that proposed that the maturation of elasmosaurid involved a shift in bone density which was related to migration from coastal waters to the open sea.{{Cite journal|last1=D'Angelo |first1=J. S. |last2=Marsà |first2=J. A. G. |last3=Agnolín |first3=F. L. |last4=Novas |first4=F. E. |year=2023 |title=Biological implications of the bone microstructure of a new elasmosaurid (Sauropterygia, Plesiosauroidea) from the uppermost Cretaceous of Patagonia |journal=Historical Biology: An International Journal of Paleobiology |volume=36 |issue=4 |pages=719–727 |doi=10.1080/08912963.2023.2180744 |s2cid=257316200}}
• O'Gorman & Otero (2023) revise the fossil material of Late Cretaceous short-necked plesiosaurs from New Zealand, and argue that only one specimen from the Tahora Formation and one from the Conway Formation can be confidently referred to the family Polycotylidae, while another specimen from the Conway Formation and one specimen from uncertain locality can be referred to this family with doubts.{{Cite journal|last1=O'Gorman |first1=J. P. |last2=Otero |first2=R. A. |year=2023 |title=Revision of the short-necked Cretaceous plesiosaurians from New Zealand |journal=Comptes Rendus Palevol |volume=22 |issue=6 |pages=77–90 |doi=10.5852/cr-palevol2023v22a6 |s2cid=257549391 |doi-access=free}}
• May et al. (2023) describe possible pliosaurid and possible small-bodied plesiosaur fossil material from the Upper Jurassic Malone Formation, representing the first Jurassic vertebrate fossils from Texas reported to date.{{Cite journal|last1=May |first1=S. R. |last2=Bader |first2=K. S. |last3=Boucher |first3=L. D. |last4=Jacobs |first4=L. L. |last5=Lively |first5=J. R. |last6=Myers |first6=T. S. |last7=Polcyn |first7=M. J. |year=2023 |title=A record of Late Jurassic vertebrates from Texas |journal=Rocky Mountain Geology |volume=58 |issue=1 |pages=19–37 |doi=10.24872/rmgjournal.58.1.19 |bibcode=2023RMGeo..58...19M |doi-access=free}}
• Fossil trackway probably produced by a plesiosaur swimming in contact with the mud at the bottom of the sea is described from the Upper Jurassic–Lower Cretaceous Maiolica Formation (Italy) by Natali & Leonardi (2023), who name a new ichnotaxon Coneroichnus marinus.{{Cite journal|last1=Natali |first1=L. |last2=Leonardi |first2=G. |year=2023 |title=Coneroichnus marinus ichnogenus et ichnospecies nov., a fossil trackway of marine reptile in the Maiolica Formation (Upper Jurassic–Lower Cretaceous) from Monte Conero, Marche, Italy |journal=Revista Brasileira de Paleontologia |volume=26 |issue=3 |pages=156–171 |doi=10.4072/rbp.2023.3.02 |doi-access=free}}
• A study on the skeletal maturity status of known plesiosaur skeletons, indicating that determination of the ontogenetic stage of the studied specimens may be confounded by paedomorphism (especially in later taxa), is published by Araújo & Smith (2023).{{Cite journal|last1=Araújo |first1=R. |last2=Smith |first2=A. S. |year=2023 |title=Recognising and quantifying the evolution of skeletal paedomorphosis in Plesiosauria |journal=Fossil Record |volume=26 |issue=1 |pages=85–101 |doi=10.3897/fr.26.97686 |doi-access=free|bibcode=2023FossR..26...85A }}

• A study on the body size evolution in turtles is published by Farina et al. (2023), who interpret their findings as indicating that body size was influenced by lineage-specific specializations, such as habitat choice, rather than global trends.{{Cite journal |last1=Farina |first1=B. M. |last2=Godoy |first2=P. L. |last3=Benson |first3=R. B. J. |last4=Langer |first4=M. C. |last5=Ferreira |first5=G. S. |title=Turtle body size evolution is determined by lineage-specific specializations rather than global trends |year=2023 |journal=Ecology and Evolution |volume=13 |issue=6 |at=e10201 |doi=10.1002/ece3.10201 |pmid=37384241 |pmc=10293707|bibcode=2023EcoEv..1310201F }}
• A study on the topological organization of the turtle skull throughout the evolutionary history of turtles is published by Miller et al. (2023), who interpret their findings as indicating that turtles have a derived cranial topology which was established early in turtle evolutionary history and subsequently conserved.{{Cite journal |last1=Miller |first1=E. |last2=Lee |first2=H. W. |last3=Abzhanov |first3=A. |last4=Evers |first4=S. W. |title=The topological organization of the turtle cranium is constrained and conserved over long evolutionary timescales |year=2023 |journal=The Anatomical Record |volume=307 |issue=8 |pages=2713–2748 |doi=10.1002/ar.25356 |pmid=38102921 |doi-access=free}}
• Szczygielski & Piechowski (2023) describe the anatomy of the limbs and girdles of Proterochersis, reporting the presence of a mosaic of characteristics suggesting either terrestrial or aquatic ecology.{{cite journal |last1=Szczygielski |first1=T. |last2=Piechowski |first2=R. |year=2023 |title=Limb anatomy of the Triassic turtles: appendicular osteology of Proterochersis (Testudinata, Proterochersidae) |journal=Zoological Journal of the Linnean Society |volume=199 |issue=3 |pages=771–831 |doi=10.1093/zoolinnean/zlad057 |doi-access=free}}
• A study on the limb bone histology in Proterochersis porebensis and Proganochelys quenstedtii, providing evidence of general microstructural patterns typical for extant turtles and of faster growth during early life stages in P. quenstedtii than in P. porebensis, is published by Szczygielski et al. (2023).{{Cite journal |last1=Szczygielski |first1=T. |last2=Klein |first2=N. |last3=Słowiak-Morkovina |first3=J. |last4=Scheyer |first4=T. M. |title=Limb histology of the Triassic stem turtles Proterochersis porebensis Szczygielski & Sulej, 2016 and Proganochelys quenstedtii Baur, 1887 with insights into growth patterns of early turtles |year=2023 |journal=Comptes Rendus Palevol |volume=22 |issue=32 |pages=635–665 |doi=10.5852/cr-palevol2023v22a32 |doi-access=free}}
• New specimen of Naomichelys speciosa, providing new information on the anatomy and intraspecific variation in this species, is described from the Lower Cretaceous Cloverly Formation (Montana, United States) by Lawver & Garner (2023).{{cite journal |last1=Lawver |first1=D. R. |last2=Garner |first2=B. A. |year=2023 |title=Skeletal variation of the stem turtle Naomichelys speciosa (Testudinata: Helochelydridae): insights from a new specimen from the Lower Cretaceous Cloverly Formation of Montana |journal=Cretaceous Research |volume=149 |at=105551 |doi=10.1016/j.cretres.2023.105551 |bibcode=2023CrRes.14905551L |s2cid=258125867}}
• Joyce et al. (2023) describe fossil material of Helochelydra nopcsai from the Lower Cretaceous strata in North Rhine-Westphalia (Germany), extending known geographic range of this species and providing new information on its anatomy.{{Cite journal|last1=Joyce |first1=W. G. |last2=Evers |first2=S. W. |last3=Ren |first3=S. |last4=Rollot |first4=Y. |last5=Schwermann |first5=A. H. |year=2023 |title=The helochelydrid turtle Helochelydra nopcsai from the Early Cretaceous (late Barremian – early Aptian) fissure fills of Balve, North Rhine-Westphalia, Germany, including a large sample of granicones |journal=Fossil Record |volume=26 |issue=1 |pages=117–133 |doi=10.3897/fr.26.102128 |doi-access=free}}
• Tong et al. (2023) describe a skull of a member of the species Solemys gaudryi from the Upper Cretaceous (Campanian) Bastide Neuve locality (Var, France), providing new information on the skull anatomy of helochelydrid turtles.{{cite journal |last1=Tong |first1=H. |last2=Buffetaut |first2=E. |last3=Méchin |first3=P. |last4=Méchin-Salessy |first4=A. |last5=Claude |first5=J. |year=2023 |title=A Solemys Skull from the Late Cretaceous of Southern France |journal=Diversity |volume=15 |issue=1 |at=58 |doi=10.3390/d15010058 |doi-access=free}}
• Chou et al. (2023) describe a new specimen of Chengyuchelys latimarginalis from the Upper Jurassic Shangshaximiao Formation (China), expanding known geographical distribution of this species and providing new information on its intraspecific variation.{{Cite journal|last1=Chou |first1=C. |last2=Xing |first2=L. |last3=Wang |first3=F. |last4=Xie |first4=X. |last5=Tong |first5=H. |year=2023 |title=A new Chengyuchelys latimarginalis record from the Upper Jurassic Shangshaximaio Formation of Sichuan Basin, China, and the intraspecific variation |journal=Historical Biology: An International Journal of Paleobiology |volume=36 |issue=5 |pages=992–1006 |doi=10.1080/08912963.2023.2201932 |s2cid=258401161}}
• The first specimen of Solnhofia parsonsi preserving largely complete and articulated limbs is described from the Kimmeridgian Torleite Formation (Germany) by Augustin et al. (2023), who interpret this finding as indicating that S. parsonsi lacked stiffened paddles otherwise present in more pelagic marine turtles, and argue against interpreting the presence flexible flippers in fossil turtles as evidence for freshwater lifestyle by itself.{{Cite journal|last1=Augustin |first1=F. J. |last2=Rabi |first2=M. |last3=Spindler |first3=F. |last4=Kampouridis |first4=P. |last5=Hartung |first5=J. |last6=Albersdörfer |first6=R. |last7=Matzke |first7=A. T. |title=A new specimen of Solnhofia parsonsi from the Upper Jurassic (Kimmeridgian) Plattenkalk deposits of Painten (Bavaria, Germany) and comments on the relationship between limb taphonomy and habitat ecology in fossil turtles |year=2023 |journal=PLOS ONE |volume=18 |issue=7 |at=e0287936 |doi=10.1371/journal.pone.0287936 |pmid=37494369 |pmc=10370695 |bibcode=2023PLoSO..1887936A |doi-access=free}}
• Pérez-García, Camilo & Ortega (2023) describe new fossil material of Hylaeochelys kappa from the Tithonian Freixial Formation (Portugal), providing new information on the anatomy and intraspecific variability in this species.{{cite journal |last1=Pérez-García |first1=A. |last2=Camilo |first2=B. |last3=Ortega |first3=F. |year=2023 |title=New Data on the Poorly Known Jurassic Record of the Turtle Hylaeochelys (Thalassochelydia), Based on New Finds from Portugal |journal=Diversity |volume=15 |issue=2 |at=167 |doi=10.3390/d15020167 |doi-access=free}}
• A specimen of Eodortoka cf. morellana, representing both the oldest occurrence of the family Dortokidae reported to date and the first record of the group from the United Kingdom, is described from the Lower Cretaceous Wessex Formation by Jacobs et al. (2023).{{cite journal |last1=Jacobs |first1=M. L. |last2=Pérez-García |first2=A. |last3=Martín-Jiménez |first3=M. |last4=Mottram |first4=C. M. |last5=Martill |first5=D. M. |last6=Gale |first6=A. S. |last7=Mattsson |first7=O. |last8=Wood |first8=C. |year=2023 |title=A well preserved pan-pleurodiran (Dortokidae) turtle from the English Lower Cretaceous and the first radiometric date for the Wessex Formation (Hauterivian-Barremian) of the Isle of Wight, United Kingdom |journal=Cretaceous Research |volume=150 |at=105590 |doi=10.1016/j.cretres.2023.105590 |bibcode=2023CrRes.15005590J |doi-access=free}}
• Cadena et al. (2023) describe new fossil material of Chelus lewisi from the Miocene Socorro Formation (Urumaco, Venezuela) and of Chelus colombiana from the La Victoria Formation (Tatacoa, Colombia), and interpret the anatomy of the studied fossils as supporting the validity of both species.{{Cite journal|last1=Cadena |first1=E.-A. |last2=Link |first2=A. |last3=Vanegas |first3=A. |last4=Avellaneda-Otero |first4=C.-A. |last5=Perdomo |first5=C. |last6=Urueña-Carrillo |first6=D. A. |last7=Sánchez |first7=R. |last8=Vanegas |first8=R. D. |last9=Scheyer |first9=T. M. |last10=Carrillo-Briceño |first10=J. D. |year=2023 |title=New insights into the fossil record of the turtle genus Chelus Duméril, 1806 including new specimens with information on cervicals and limb bones |journal=Comptes Rendus Palevol |volume=22 |issue=34 |pages=689–709 |doi=10.5852/cr-palevol2023v22a34 |doi-access=free}}
• Martín-Jiménez & Pérez-García (2023) present the reconstruction of the skull and neuroanatomical structures of the holotype of Euraxemys essweini.{{cite journal |last1=Martín-Jiménez |first1=M. |last2=Pérez-García |first2=A. |year=2023 |title=Neuroanatomical Study and Three-Dimensional Cranial Reconstruction of the Brazilian Albian Pleurodiran Turtle Euraxemys essweini |journal=Diversity |volume=15 |issue=3 |at=374 |doi=10.3390/d15030374 |doi-access=free}}
• A study on the ecology of Araripemys barretoi is published by Batista, Carvalho & de la Fuente (2023).{{Cite journal|last1=Batista |first1=D. L. |last2=Carvalho |first2=I. S. |last3=de la Fuente |first3=M. S. |year=2023 |title=Araripemys barretoi: Paleoecological analysis of a pelomedusoid Chelonia from the Lower Cretaceous of Araripe and Parnaíba basins, Brazil |journal=Cretaceous Research |volume=148 |at=105503 |doi=10.1016/j.cretres.2023.105503 |bibcode=2023CrRes.14805503B |s2cid=256786671}}
• Bogado et al. (2023) describe new fossil material of Roxochelys from the Upper Cretaceous Presidente Prudente Formation (Brazil), and provide an emended diagnosis for Roxochelys.{{cite journal |last1=Bogado |first1=J. P. |last2=Pereira |first2=P. V. L. G. C. |last3=de la Fuente |first3=M. S. |last4=Bergqvist |first4=L. P. |year=2023 |title=New records of Testudines from the Presidente Prudente Formation of the Bauru group (Late Cretaceous), with a revised diagnosis for Roxochelys wanderleyi and palaeoichnological remarks |journal=Journal of South American Earth Sciences |volume=128 |at=104478 |doi=10.1016/j.jsames.2023.104478 |bibcode=2023JSAES.12804478B |s2cid=259379689}}
• Martín-Jiménez & Pérez-García (2023) provide a three-dimensional reconstruction of the anatomical and neuroanatomical cranial structures of Neochelys arenarum.{{Cite journal|last1=Martín-Jiménez |first1=M. |last2=Pérez-García |first2=A. |year=2023 |title=Neuroanatomical study of the podocnemidid turtle Neochelys arenarum (Pleurodira), from the early Eocene of France |journal=The Anatomical Record |doi=10.1002/ar.25217 |pmid=36974769 |s2cid=257772937 |doi-access=free|pmc=12062562 }}
• A study on the anatomy of the mandible of Glyptops ornatus is published by Evers (2023), who interprets G. ornatus as a likely active aquatic hunter.{{Cite journal|last=Evers |first=S. W. |year=2023 |title=Mandibular anatomy of the paracryptodire Glyptops ornatus supports active hunting behavior in a Jurassic turtle |journal=The Anatomical Record |volume=307 |issue=6 |pages=2007–2017 |doi=10.1002/ar.25320 |pmid=37747271 |doi-access=free}}
• Smith, Berg & Adrian (2023) describe a well-preserved skull of a specimen of Plesiobaena antiqua from the Judith River Formation (Montana, United States), providing new information on the morphology of the middle and inner ear and endocast of baenids.{{Cite journal|last1=Smith |first1=H. F. |last2=Berg |first2=M. |last3=Adrian |first3=B. |year=2023 |title=A well-preserved cranium from the Judith River Formation (Montana, USA) reveals the inner ear and neuroanatomy of a Campanian baenid turtle |journal=The Anatomical Record |volume=306 |issue=6 |pages=1431–1451 |doi=10.1002/ar.25185 |pmid=36899495 |s2cid=257438399}}
• Description of a partial skeleton of Denazinemys nodosa from the Campanian Kaiparowits Formation (Utah, United States) and a study on the phylogenetic affinities of this taxon is published by Spicher et al. (2023).{{Cite journal|last1=Spicher |first1=G. E. |last2=Sertich |first2=J. J. W. |last3=Girard |first3=L. C. |last4=Joyce |first4=W. G. |last5=Lyson |first5=T. R. |last6=Rollot |first6=Y. |year=2023 |title=A description of a Denazinemys nodosa specimen (Testudinata, Baenidae) from the Late Cretaceous Kaiparowits Formation of southern Utah |journal=Fossil Record |volume=26 |issue=2 |pages=151–170 |doi=10.3897/fr.26.102520 |doi-access=free|bibcode=2023FossR..26..151S }}
• Description of the anatomy of the skull and mandible of Plastomenus thomasii, and a study on the phylogenetic relationships and the evolutionary history of softshell turtles, is published by Evers, Chapelle & Joyce (2023).{{cite journal |last1=Evers |first1=S. W. |last2=Chapelle |first2=K. E. J. |last3=Joyce |first3=W. G. |year=2023 |title=Cranial and mandibular anatomy of Plastomenus thomasii and a new time-tree of trionychid evolution |journal=Swiss Journal of Palaeontology |volume=142 |issue=1 |at=1 |doi=10.1186/s13358-023-00267-5 |pmid=36941994 |pmc=10020266 |doi-access=free|bibcode=2023SwJP..142....1E }}
• Redescription of Rafetus bohemicus is published by Chroust et al. (2023).{{Cite journal|last1=Chroust |first1=M. |last2=Mazuch |first2=M. |last3=Ivanov |first3=M. |last4=Alba |first4=D. M. |last5=Luján |first5=À. H. |year=2023 |title=Redescription of the soft-shell turtle Rafetus bohemicus (Testudines, Trionychidae) from the Early Miocene of Czechia |journal=PeerJ |volume=11 |at=e15658 |doi=10.7717/peerj.15658 |pmid=37525660 |pmc=10387236 |doi-access=free}}
• Cadena & Combita-Romero (2023) describe protostegid fossil material from the Lower Cretaceous (Valanginian) Rosablanca Formation (Colombia), representing both the earliest protostegid record reported to date and the largest Early Cretaceous protostegid worldwide, providing evidence of early evolution of large size in protostegids.{{Cite journal|last1=Cadena |first1=E.-A. |last2=Combita-Romero |first2=D. A. |year=2023 |title=The onset of large size in Cretaceous marine turtles (Protostegidae) evidenced by new fossil remains from the Valanginian of Colombia |journal=Zoological Journal of the Linnean Society |volume=202 |issue=1 |doi=10.1093/zoolinnean/zlad053}}
• A study on the long bone microstructure of Protostega gigas is published by Wilson (2023), who interprets her findings as indicating that P. gigas, unlike the more basal protostegid Desmatochelys, had rapid bone growth patterns similar to those of extant leatherback sea turtles.{{Cite journal|last=Wilson |first=L. E. |year=2023 |title=Rapid growth in Late Cretaceous sea turtles reveals life history strategies similar to extant leatherbacks |journal=PeerJ |volume=11 |at=e14864 |doi=10.7717/peerj.14864 |pmid=36793890 |pmc=9924133 |doi-access=free}}
• Purported plant fossils from the Lower Cretaceous Paja Formation (Colombia), originally described as Sphenophyllum colombianum, are reinterpreted by Palma-Castro et al. (2023) as hatchling marine turtles, representing the first finding of hatchlings turtle carapaces from northwestern South America reported to date.{{cite journal|last1=Palma-Castro |first1=H. D. |last2=Cómbita-Romero |first2=D. A. |last3=Cadena |first3=E.-A. |last4=Carvalho |first4=M. R. |last5=Herrera |first5=F. |title=An Early Cretaceous Sphenophyllum or a hatchling turtle? |year=2023 |journal=Palaeontologia Electronica |volume=26 |issue=3 |at=26.3.a50 |doi=10.26879/1306 |doi-access=free}}
• Fossil material of a sea turtle is described from the Lutetian Santiago Formation, California by Poust, Holroyd & Deméré (2023), providing evidence of the presence of sea turtles in North Pacific during the middle Eocene.{{Cite journal|last1=Poust |first1=A. W. |last2=Holroyd |first2=P. A. |last3=Deméré |first3=T. A. |year=2023 |title=An Eocene sea turtle from the eastern North Pacific fills a Paleogene gap |journal=Acta Palaeontologica Polonica |volume=68 |issue=1 |pages=47–51 |doi=10.4202/app.01034.2022 |s2cid=257423413 |doi-access=free}}
• Zvonok, Benitskiy & Danilov (2023) describe new fossil material of Tasbacka aldabergeni from the Paleogene (Paleocene or Ypresian) Kudinovka locality (Rostov Oblast, Russia), including the most complete postcranial skeleton of a member of this species, providing new information on its anatomy.{{Cite journal |last1=Zvonok |first1=E. A. |last2=Benitskiy |first2=K. S. |last3=Danilov |first3=I. G. |year=2023 |title=The sea turtle Tasbacka aldabergeni Nessov, 1987 from the lower Paleogene deposits of the Kudinovka locality (Rostov Province, Russia) |journal=Paleontological Journal |volume=57 |issue=2 |pages=217–230 |doi=10.1134/S0031030123020144 |bibcode=2023PalJ...57..217Z |s2cid=258640566 |url=https://elibrary.ru/item.asp?id=50434962}}
• A carapace of a sea turtle representing the oldest record of the genus Lepidochelys reported to date is described from the Miocene Chagres Formation (Panama) by Cadena, De Gracia & Combita-Romero (2023), who report evidence of exceptional preservation of bone microstructure, including remains of blood vessels, collagen fibers, osteocytes with possible DNA.{{Cite journal |last1=Cadena |first1=E.-A. |last2=De Gracia |first2=C. |last3=Combita-Romero |first3=D. A. |year=2023 |title=An Upper Miocene marine turtle from Panama that preserves osteocytes with potential DNA |journal=Journal of Vertebrate Paleontology |volume=43 |issue=1 |at=e2254356 |doi=10.1080/02724634.2023.2254356 |doi-access=free}}
• A study on the diversification of tortoises throughout their evolutionary history is published by Silveira et al. (2023).{{Cite journal|last1=Silveira |first1=I. O. |last2=Liparini |first2=A. |last3=Martinez |first3=P. A. |last4=Eduardo |first4=A. A. |year=2023 |title=The global Cenozoic diversification process of tortoises (Testudinidae) |journal=The Anatomical Record |volume=306 |issue=6 |pages=1528–1536 |doi=10.1002/ar.25182 |pmid=36951396 |s2cid=257694745}}
• A study on the bone histology of fossil and extant angulate tortoises from South Africa, providing evidence of impact of environmental conditions on the growth of studied tortoises, is published by Bhat, Chinsamy & Parkington (2023).{{Cite journal|last1=Bhat |first1=M. S. |last2=Chinsamy |first2=A. |last3=Parkington |first3=J. |year=2023 |title=Bone histology of Neogene angulate tortoises (Testudines: Testudinidae) from South Africa: palaeobiological and skeletochronological implications |journal=Royal Society Open Science |volume=10 |issue=3 |at=230064 |doi=10.1098/rsos.230064 |pmid=36908987 |pmc=9993054 |bibcode=2023RSOS...1030064B |doi-access=free}}
• Delfino et al. (2023) describe Late Pleistocene fossils representing the first fossil material of Testudo hermanni hermanni from Sicily reported to date.{{Cite journal|last1=Delfino |first1=M. |last2=Fritz |first2=U. |last3=Bonfiglio |first3=L. |last4=Marino |first4=L. |last5=Ragni |first5=C. |last6=Insacco |first6=G. |title=Late Pleistocene evidence for the presence of Hermann's tortoise (Testudo hermanni) in Sicily |year=2023 |journal=Bollettino della Società Paleontologica Italiana |volume=62 |issue=3 |pages=289–299 |doi=10.4435/BSPI.2023.11|doi-broken-date=2024-11-20 }}
• A study on the relationship of body size to climate and on the role of metabolism in governing size in turtles is published by Parker et al. (2023), who report that the Plio-Pleistocene fossil record of turtles from the Shungura Formation (Ethiopia) included tortoises which were significantly larger than any extant African taxon, but aquatic turtles did not reach significantly larger maximum sizes than extant eastern African turtles; the authors find the studied fossil record of turtles to be consistent with habitat reconstructions for the Shungura Formation, interpret it as indicating that temperature-dependent metabolism likely wasn't a dominant factor for body size sorting in turtles from the Shungura Formation, and argue that the extinction of the largest eastern African tortoises may have been driven, in part, by human exploitation.{{Cite journal|last1=Parker |first1=A. K. |last2=Müller |first2=J. |last3=Boisserie |first3=J.-R. |last4=Head |first4=J. J. |year=2023 |title=The utility of body size as a functional trait to link the past and present in a diverse reptile clade |journal=Proceedings of the National Academy of Sciences of the United States of America |volume=120 |issue=7 |at=e2201948119 |doi=10.1073/pnas.2201948119 |pmid=36745796 |pmc=9964042 |bibcode=2023PNAS..12001948P}}
• Revision of the fossil material of Paleogene turtles from Eastern Europe is published by Zvonok & Danilov (2023).{{Cite journal|last1=Zvonok |first1=E. A. |last2=Danilov |first2=I. G. |year=2023 |title=Paleogene turtles of Eastern Europe: new findings and a revision |journal=Proceedings of the Zoological Institute of the Russian Academy of Sciences |volume=327 |issue=3 |pages=496–554 |url=https://www.zin.ru/journals/trudyzin/eng/publication.html?id=521 |doi=10.31610/trudyzin/2023.327.3.496 |doi-access=free}}

{{Main|2023 in archosaur paleontology}}

• A study on the bone histology of Chanaresuchus bonapartei and Tropidosuchus romeri from the Chañares Formation (Argentina) is published by Garcia Marsà et al. (2023), who interpret their findings as indicative of variability of the developmental patterns in the studied taxa, as well as suggestive of their terrestrial lifestyle.{{Cite journal |last1=Garcia Marsà |first1=J. A. |last2=Ponce |first2=D. A. |last3=Agnolín |first3=F. L. |last4=Novas |first4=F. E. |title=Histovariability and lifestyle in Proterochampsidae Romer, 1966 (Archosauriformes) from the Chañares Formation (Late Triassic), northwestern Argentina |year=2023 |journal=Comptes Rendus Palevol |volume=22 |issue=30 |pages=605–622 |doi=10.5852/cr-palevol2023v22a30 |doi-access=free}}
• A study on the locomotor capabilities of Euparkeria capensis is published by Demuth, Wiseman & Hutchinson (2023), who conclude that it is unlikely that Euparkeria was facultatively bipedal, and was probably quadrupedal.{{Cite journal|last1=Demuth |first1=O. E. |last2=Wiseman |first2=A. L. A. |last3=Hutchinson |first3=J. R. |year=2023 |title=Quantitative biomechanical assessment of locomotor capabilities of the stem archosaur Euparkeria capensis |journal=Royal Society Open Science |volume=10 |issue=1 |at=221195 |doi=10.1098/rsos.221195 |pmid=36704253 |pmc=9874271 |bibcode=2023RSOS...1021195D |doi-access=free}}

• Redescription and a study on the affinities of Coelostegus prothales is published by Klembara et al. (2023).{{Cite journal|last1=Klembara |first1=J. |last2=Ruta |first2=M. |last3=Anderson |first3=J. |last4=Mayer |first4=T. |last5=Hain |first5=M. |last6=Valaška |first6=D. |title=A review of Coelostegus prothales Carroll and Baird, 1972 from the Upper Carboniferous of the Czech Republic and the interrelationships of basal eureptiles |year=2023 |journal=PLOS ONE |volume=18 |issue=9 |at=e0291687 |doi=10.1371/journal.pone.0291687 |pmid=37733816 |pmc=10513281 |doi-access=free|bibcode=2023PLoSO..1891687K }}
• Redescription of the holotype specimen of Delorhynchus cifellii is published by Rowe, Bevitt & Reisz (2023).{{Cite journal|last1=Rowe |first1=D. C. T. |last2=Bevitt |first2=J. J. |last3=Reisz |first3=R. R. |year=2023 |title=Skeletal anatomy of the early Permian parareptile Delorhynchus with new information provided by neutron tomography |journal=PeerJ |volume=11 |at=e15935 |doi=10.7717/peerj.15935 |pmid=37637171 |pmc=10452630 |doi-access=free}}
• Pohlmann et al. (2023) describe new cranial material of Procolophon trigoniceps from the Sanga do Cabral Formation (Brazil), preserving evidence of temporal fenestration, and interpret the recurrent presence and varying morphology of temporal fenestrae in P. trigoniceps as supporting its characterization as an anomalous trait within the species.{{cite journal |last1=Pohlmann |first1=K. |last2=Cisneros |first2=J. C. |last3=Da-Rosa |first3=Á. A. S. |last4=Pinheiro |first4=F. L. |year=2023 |title=Temporal fenestration in a Procolophon trigoniceps specimen (Procolophonoidea) from the Lower Triassic of Brazil |journal=The Anatomical Record |volume=307 |issue=4 |pages=744–751 |doi=10.1002/ar.25354 |pmid=37982365}}
• Description of new fossil material of Libognathus sheddi from the Upper Triassic Cooper Canyon Formation (Texas, United States), providing new information on the skull anatomy of this procolophonid, is published by Mueller et al. (2023).{{cite journal |last1=Mueller |first1=B. D. |last2=Small |first2=B. J. |last3=Jenkins |first3=X. |last4=Huttenlocker |first4=A. K. |last5=Chatterjee |first5=S. |year=2023 |title=Cranial anatomy of Libognathus sheddi Small, 1997 (Parareptilia, Procolophonidae) from the Upper Triassic Dockum Group of West Texas, USA |journal=The Anatomical Record |volume=307 |issue=4 |pages=1421–1441 |doi=10.1002/ar.25364 |pmid=38071453}}
• Van den Brandt et al. (2023) provide the first volumetric body mass estimate of Bradysaurus baini.{{Cite journal|last1=Van den Brandt |first1=M. J. |last2=Day |first2=M. O. |last3=Manucci |first3=F. |last4=Viglietti |first4=P. A. |last5=Angielczyk |first5=K. D. |last6=Romano |first6=M. |year=2023 |title=First volumetric body mass estimate and a new in vivo 3D reconstruction of the oldest Karoo pareiasaur Bradysaurus baini, and body size evolution in Pareiasauria |journal=Historical Biology: An International Journal of Paleobiology |volume=36 |issue=3 |pages=587–601 |doi=10.1080/08912963.2023.2175211 |s2cid=257369904 |url=https://www.tandfonline.com/doi/full/10.1080/08912963.2023.2175211}}
• A study on the structure and placement of the osteoderm cover of Scutosaurus tuberculatus is published by Boyarinova & Golubev (2023).{{cite journal|last1=Boyarinova |first1=E. I. |last2=Golubev |first2=V. K. |year=2023 |title=Topographic Morphology of the Postcranial Osteoderm Cover of an Adult Scutosaurus tuberculatus (Amalitzky) (Pareiasaurina) from the Late Permian of Eastern Europe |journal=Paleontological Journal |volume=56 |issue=11 |pages=1437–1458 |doi=10.1134/S003103012211003X |s2cid=256618503}}
• New information on the anatomy of the palate and mandible of Youngina capensis is presented by Hunt et al. (2023), who interpret the anatomy of the studied bones as supporting the phylogenetic placement of Youngina as an early diverging neodiapsid.{{cite journal|last1=Hunt |first1=A. K. |last2=Ford |first2=D. P. |last3=Fernandez |first3=V. |last4=Choiniere |first4=J. N. |last5=Benson |first5=R. B. J. |year=2023 |title=A description of the palate and mandible of Youngina capensis (Sauropsida, Diapsida) based on synchrotron tomography, and the phylogenetic implications |journal=Papers in Palaeontology |volume=9 |issue=5 |at=e1521 |doi=10.1002/spp2.1521 |s2cid=261547253 |doi-access=free|bibcode=2023PPal....9E1521H }}
• A study on the morphology of the femora of members of Drepanosauromorpha, interpreted as indicative of increased capacity for femoral adduction and protraction relative to most other Permo-Triassic diapsids, is published by Pritchard et al. (2023).{{Cite journal|last1=Pritchard |first1=A. C. |last2=Irmis |first2=R. B. |last3=Olori |first3=J. C. |last4=Nesbitt |first4=S. J. |last5=Smith |first5=N. D. |last6=Stocker |first6=M. R. |last7=Turner |first7=A. H. |year=2023 |title=The femora of Drepanosauromorpha (Reptilia: Diapsida): Implications for the functional evolution of the thigh of Sauropsida |journal=The Anatomical Record |volume=306 |issue=8 |pages=2102–2118 |doi=10.1002/ar.25160 |pmid=36847780 |s2cid=257217856}}
• A study on the anatomy of the hindlimbs of Megalancosaurus preonensis and M. endennae is published by Renesto & Saller (2023), who interpret the differences in the skeletal anatomy of the studied drepanosauromorphs as indicating that the two species may have exploited different microhabitats in the arboreal environment.{{Cite journal |last1=Renesto |first1=S. |last2=Saller |first2=F. |title=Differences in the hindlimb anatomy in the two species of the Late Triassic drepanosauromorph diapsid Megalancosaurus indicate habitat partitioning within the arboreal environment |year=2023 |journal=Rivista Italiana di Paleontologia e Stratigrafia |volume=129 |issue=2 |pages=309–328 |doi=10.54103/2039-4942/19176 |s2cid=259021119 |url=https://riviste.unimi.it/index.php/RIPS/article/view/19176 |doi-access=free}}
• Browstein et al. (2023) exclude Cryptovaranoides microlanius from the crown group of Squamata, and consider it to be a neodiapsid of unclear placement with possible affinities to early archosauromorphs.{{Cite journal|last1=Browstein |first1=C. D. |last2=Simões |first2=T. R. |last3=Caldwell |first3=M. W. |last4=Lee |first4=M. S. Y. |last5=Meyer |first5=D. L. |last6=Scarpetta |first6=S. G. |year=2023 |title=The affinities of the Late Triassic Cryptovaranoides and the age of crown squamates |journal=Royal Society Open Science |volume=10 |issue=10 |at=230968 |doi=10.1098/rsos.230968 |pmid=37830017 |pmc=10565374 |doi-access=free}}
• Roese-Miron et al. (2023) compare the endocasts of Clevosaurus brasiliensis and extant tuatara, reporting that the reptilian encephalization quotient of C. brasiliensis in much lower than that of the tuatara, and providing evidence of a previously undocumented neuroanatomical diversity among rhynchocephalians.{{Cite journal|last1=Roese-Miron |first1=L. |last2=Jones |first2=M. E. H. |last3=Ferreira |first3=J. D. |last4=Hsiou |first4=A. S. |year=2023 |title=Virtual endocasts of Clevosaurus brasiliensis and the tuatara: Rhynchocephalian neuroanatomy and the oldest endocranial record for Lepidosauria |journal=The Anatomical Record |volume=307 |issue=4 |pages=1366–1389 |doi=10.1002/ar.25212 |pmid=36951279 |s2cid=257694276}}
• Probable sphenodontian burrows are described from the Lower Cretaceous (Aptian) Cerro Barcino Formation (Argentina) by Melchor et al. (2023).{{Cite journal|last1=Melchor |first1=R. |last2=Perez |first2=M. |last3=Villegas |first3=P. |last4=Espinoza |first4=N. |last5=Umazano |first5=A. |last6=Cardonatto |first6=M. C. |year=2023 |title=Early Cretaceous lepidosaur (sphenodontian?) burrows |journal=Scientific Reports |volume=13 |issue=1 |at=10209 |doi=10.1038/s41598-023-37385-6 |pmid=37353642 |pmc=10290101 |bibcode=2023NatSR..1310209M |doi-access=free}}
• Redescription of Wapitisaurus problematicus is published by Bastiaans, Buffa & Scheyer (2023), who reinterpret this reptile as a member of Thalattosauroidea.{{Cite journal|last1=Bastiaans |first1=D. |last2=Buffa |first2=V. |last3=Scheyer |first3=T. M. |year=2023 |title=To glide or to swim? A reinvestigation of the enigmatic Wapitisaurus problematicus (Reptilia) from the Early Triassic of British Columbia, Canada |journal=Royal Society Open Science |volume=10 |issue=11 |at=231171 |doi=10.1098/rsos.231171 |pmc=10646446 |doi-access=free|pmid=38026014 |bibcode=2023RSOS...1031171B }}
• A study comparing bone histology of Askeptosaurus italicus and an unnamed thalattosauroid from the Vester Formation (Oregon, United States), providing evidence of different growth patterns in the studied thalattosaurs, is published by Klein et al. (2023).{{Cite journal|last1=Klein |first1=N. |last2=Sander |first2=P. M. |last3=Liu |first3=J. |last4=Druckenmiller |first4=P. |last5=Metz |first5=E. T. |last6=Kelley |first6=N. P. |last7=Scheyer |first7=T. M. |year=2023 |title=Comparative bone histology of two thalattosaurians (Diapsida: Thalattosauria): Askeptosaurus italicus from the Alpine Triassic (Middle Triassic) and a Thalattosauroidea indet. from the Carnian of Oregon (Late Triassic) |journal=Swiss Journal of Palaeontology |volume=142 |issue=1 |at=15 |doi=10.1186/s13358-023-00277-3 |pmid=37601161 |pmc=10432342 |doi-access=free|bibcode=2023SwJP..142...15K }}
• Redescription of the holotype of Wayaosaurus bellus is published by Chai et al. (2023), who consider Miodentosaurus brevis to be a possible junior synonym of W. bellus, and interpret thalattosaur morphology as indicating that, unlike sauropterygians and ichthyosauriforms, thalattosaurs night have been adapted only to the nearshore environments.{{Cite journal|last1=Chai |first1=J. |last2=Lu |first2=H. |last3=Jiang |first3=D.-Y. |last4=Motani |first4=R. |last5=Druckenmiller |first5=P. S. |last6=Tintori |first6=A. |last7=Kelley |first7=N. P. |year=2023 |title=Reidentification of Wayaosaurus bellus and the conservative trunk and tail shape of Thalattosauria |journal=Historical Biology: An International Journal of Paleobiology |volume=36 |issue=12 |pages=2537–2556 |doi=10.1080/08912963.2023.2264886}}
• A study on the stable carbon, oxygen and sulfur isotope compositions of bones of two specimens of Odontochelys is published by Goedert et al. (2023), who interpret their findings as indicating that Odontochelys was herbivorous and lived in a coastal marine environment.{{cite journal |last1=Goedert |first1=J. |last2=Amiot |first2=R. |last3=Anquetin |first3=J. |last4=Séon |first4=N. |last5=Bourgeais |first5=R. |last6=Bailly |first6=G. |last7=Fourel |first7=F. |last8=Simon |first8=L. |last9=Li |first9=C. |last10=Wang |first10=W. |last11=Lécuyer |first11=C. |year=2023 |title=Multi-isotopic analysis reveals the early stem turtle Odontochelys as a nearshore herbivorous forager |journal=Frontiers in Ecology and Evolution |volume=11 |at=1175128 |doi=10.3389/fevo.2023.1175128 |doi-access=free}}
• Jiang et al. (2023) report the discovery of an embryo of a member of the genus Ikechosaurus from the Lower Cretaceous Jiufotang Formation (China) preserved inside a parchment-shelled egg, interpret the ossification sequence of the embryo as confirming the placement of choristoderans within Archosauromorpha, and interpret this finding as suggesting that the ancestral amniote displayed extended embryo retention, including viviparity.{{Cite journal|last1=Jiang |first1=B. |last2=He |first2=Y. |last3=Elsler |first3=A. |last4=Wang |first4=S. |last5=Keating |first5=J. N. |last6=Song |first6=J. |last7=Kearns |first7=S. L. |last8=Benton |first8=M. J. |year=2023 |title=Extended embryo retention and viviparity in the first amniotes |journal=Nature Ecology & Evolution |volume=7 |issue=7 |pages=1131–1140 |doi=10.1038/s41559-023-02074-0 |pmid=37308704 |pmc=10333127|bibcode=2023NatEE...7.1131J }}
• Dudgeon, Mallon & Evans (2023) describe a specimen of Champsosaurus lindoei from the Two Medicine Formation (Montana, United States), representing the first confirmed record of this species outside of Dinosaur Provincial Park and its vicinity, and providing evidence that Champsosaurus was able to live in drier environments than previously thought.{{Cite journal|last1=Dudgeon |first1=T. W. |last2=Mallon |first2=J. C. |last3=Evans |first3=D. C. |year=2023 |title=The first report of Champsosaurus lindoei (Choristodera: Champsosauridae) from the Campanian of the United States: anatomical, phylogenetic, and palaeoecological significance |journal=Zoological Journal of the Linnean Society |volume=200 |issue=3 |pages=776–795 |doi=10.1093/zoolinnean/zlad087 |doi-access=free}}
• Spiekman & Mujal (2023) describe two specimens of Tanystropheus (belonging to the species T. hydroides and T. longobardicus) from the Middle Triassic Monte San Giorgio Lagerstätte with completely severed necks, and interpret the studied specimens as likely victims of a predatory attack, providing evidence that the long neck of Tanystropheus might have been susceptible to predation.{{Cite journal|last1=Spiekman |first1=S. N. F. |last2=Mujal |first2=E. |year=2023 |title=Decapitation in the long-necked Triassic marine reptile Tanystropheus |journal=Current Biology |volume=33 |issue=13 |pages=R708–R709 |doi=10.1016/j.cub.2023.04.027 |url=https://www.sciencedirect.com/science/article/abs/pii/S096098222300475X |pmid=37343555 |bibcode=2023CBio...33R.708S |s2cid=259207369}}
• Redescription of Anisodontosaurus greeri is published by Foffa et al. (2023), who provide new information on the anatomy of this reptile, supporting its referral to the clade Trilophosauridae.{{Cite journal |last1=Foffa |first1=D. |last2=Nesbitt |first2=S. J. |last3=Kligman |first3=B. T. |last4=Butler |first4=R. J. |last5=Stocker |first5=M. R. |year=2023 |title=New specimen and redescription of Anisodontosaurus greeri (Moenkopi Formation: Middle Triassic) and the spatiotemporal origins of Trilophosauridae |journal=Journal of Vertebrate Paleontology |volume=42 |issue=6 |at=e2220015 |doi=10.1080/02724634.2023.2220015 |doi-access=free}}
• A study on microwear patterns in teeth of trilophosaurids is published by Mellett et al. (2023), who interpret their findings as suggestive of niche partitioning in closely related trilophosaurids in the Norian American Southwest.{{Cite journal|last1=Mellett |first1=M. P. |last2=Kligman |first2=B. T. |last3=Nesbitt |first3=S. J. |last4=Stocker |first4=M. R. |title=Masticatory mechanisms, dental function, and diet in Triassic trilophosaurids (Reptilia: Allokotosauria) |year=2023 |journal=Palaeodiversity |volume=16 |issue=1 |pages=99–124 |doi=10.18476/pale.v16.a4 |s2cid=258691923 |doi-access=free}}
• Redescription of the skull of the holotype of Bentonyx sidensis, including description of previously obscured anatomical details, is published by Sethapanichsakul, Coram & Benton (2023).{{Cite journal|last1=Sethapanichsakul |first1=T. |last2=Coram |first2=R. A. |last3=Benton |first3=M. J. |year=2023 |title=New information on the cranial anatomy of the Middle Triassic rhynchosaurian reptile Bentonyx sidensis |journal=Acta Palaeontologica Polonica |volume=68 |issue=1 |pages=53–62 |doi=10.4202/app.01019.2022 |s2cid=256169114 |doi-access=free}}
• A study on tooth implantation in rhynchosaurs and on changes in their teeth and jaw morphology as they aged is published by Sethapanichsakul, Coram & Benton (2023), who interpret the fossil record of rhynchosaurs as indicative of two phases of diversification, first in the Anisian, and second following the Carnian pluvial episode.{{Cite journal|last1=Sethapanichsakul |first1=T. |last2=Coram |first2=R. A. |last3=Benton |first3=M. J. |year=2023 |title=Unique dentition of rhynchosaurs and their two-phase success as herbivores in the Triassic |journal=Palaeontology |volume=66 |issue=3 |at=e12654 |doi=10.1111/pala.12654 |doi-access=free|bibcode=2023Palgy..6612654S }}
• Redescription of the holotype specimen of Prolacerta broomi is published by Sobral (2023).{{Cite journal|last=Sobral |first=G. |year=2023 |title=The holotype of the basal archosauromorph Prolacerta broomi revisited |journal=Acta Palaeontologica Polonica |volume=68 |issue=3 |pages=393–413 |doi=10.4202/app.01067.2023 |url=https://app.pan.pl/article/item/app010672023.html |doi-access=free}}

• A study on the relationship between femoral microstructure and posture in extant reptiles, and on its implications for the reconstruction of the posture of extinct reptiles, is published by Gônet et al. (2023), who find that the posture can be reliably inferred for extinct reptile taxa that preceded and followed the quadruped/biped and sprawling/erect transitions, but also that the inferences are more questionable for taxa contemporary with these transitions.{{Cite journal|last1=Gônet |first1=J. |last2=Bardin |first2=J. |last3=Girondot |first3=M. |last4=Hutchinson |first4=J. R. |last5=Laurin |first5=M. |year=2023 |title=Locomotor and postural diversity among reptiles viewed through the prism of femoral microanatomy: Palaeobiological implications for some Permian and Mesozoic taxa |journal=Journal of Anatomy |volume=242 |issue=5 |pages=891–916 |doi=10.1111/joa.13833 |pmid=36807199 |pmc=10093171 |s2cid=257037744}}
• A study on the nasal passage shapes and nasal airflow patterns in extant diapsids, comparing simulated airflow patterns in nasal passages without soft tissues (representing the typical degree of nasal passage preservation in fossils) and with soft tissues, is published by Bourke & Witmer (2023), who interpret their findings as indicating that previous nasal passage reconstructions in extinct species might overestimate airway size, which might affect estimates of physiological capacities of the nasal passages.{{Cite journal|last1=Bourke |first1=J. M. |last2=Witmer |first2=L. M. |year=2023 |title=Soft tissues influence nasal airflow in diapsids: Implications for dinosaurs |journal=Journal of Morphology |volume=284 |issue=9 |at=e21619 |doi=10.1002/jmor.21619 |pmid=37585224 |doi-access=free}}
• Hoffman, Hancox & Nesbitt (2023) describe an assemblage of teeth of diapsid reptiles from the Lower Triassic Burgersdorp Formation (South Africa), report the presence of seven tooth morphotypes which are distinct but show limited morphological disparity, and interpret this finding as confirming that the recovery of diverse ecosystems after the Permian–Triassic extinction event was delayed until the Middle or even the Late Triassic.{{Cite journal|last1=Hoffman |first1=D. K. |last2=Hancox |first2=J. P. |last3=Nesbitt |first3=S. J. |title=A diverse diapsid tooth assemblage from the Early Triassic (Driefontein locality, South Africa) records the recovery of diapsids following the end-Permian mass extinction |year=2023 |journal=PLOS ONE |volume=18 |issue=5 |at=e0285111 |doi=10.1371/journal.pone.0285111 |pmid=37126508 |pmc=10150976 |bibcode=2023PLoSO..1885111H |doi-access=free}}
• Zverkov et al. (2023) describe Late Cretaceous reptile fossils from the Pyasina River, Tanama River and Kheta River basins (Siberia, Russia), representing the northernmost Cretaceous Eurasian occurrences of plesiosaurs, turtles and possibly mosasaurids reported to date, and including immature plesiosaur fossils which might indicate that the Late Cretaceous shallow waters in the studied area were a breeding and nursery area for plesiosaurs.{{Cite journal|last1=Zverkov |first1=N. G. |last2=Rogov |first2=M. A. |last3=Zakharov |first3=V. A. |last4=Danilov |first4=I. G. |last5=Grigoriev |first5=D. V. |last6=M. |first6=Košťák |year=2023 |title=Northernmost occurrences of plesiosaurs and turtles in the Upper Cretaceous of Eurasia |journal=Cretaceous Research |volume=148 |at=105537 |doi=10.1016/j.cretres.2023.105537 |bibcode=2023CrRes.14805537Z |s2cid=257654850}}
• A study on the competition for prey between Miocene mammalian and reptilian predators at La Venta (Colombia) is published by Wilson & Parker (2023), who interpret their findings as indicative of limited competition for resources among the carnivore guild compared to the most similar extant communities, a dominant role of crocodyliform predators in the studied community, and low predation pressure which might have resulted in overpopulation leading to feeding stress in the notoungulate species Pericotoxodon platignathus.{{Cite journal|last1=Wilson |first1=O. E. |last2=Parker |first2=A. K. |year=2023 |title=Low predator competition indicates occupation of macro-predatory niches by giant Miocene reptiles at La Venta, Colombia |journal=Palaeogeography, Palaeoclimatology, Palaeoecology |volume=632 |at=111843 |doi=10.1016/j.palaeo.2023.111843 |doi-access=free|bibcode=2023PPP...63211843W }}

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Category:2023 in paleontology