2019 in paleoichthyology

• Revision of Early Devonian psammosteids described by Beverly Halstead from the so-called "Placoderm Sandstone" (Świętokrzyskie Mountains, Poland) is published by Dec (2019).{{cite journal |author=Marek Dec |year=2019 |title=Revision of the Early Devonian psammosteids from the "Placoderm Sandstone": Implications for their body shape reconstruction |journal=Palaeontologia Electronica |volume=22 |issue=2 |pages=Article number 22.2.36 |doi=10.26879/948 |s2cid=198419981 |doi-access=free }}
• A study on the locomotion of psammosteids, focusing on the influence of the shape of the psammosteid body form on hydrodynamic performance, is published by Dec (2019).{{Cite journal|author=Marek Dec |year=2019 |title=Hydrodynamic performance of psammosteids: New insights from computational fluid dynamics simulations |journal=Acta Palaeontologica Polonica |volume=64 |issue=4 |pages=679–684 |doi=10.4202/app.00623.2019 |s2cid=207822008 |doi-access=free }}
• A study on the anatomy of dermal plates of Astraspis is published by Lemierre & Germain (2019), who report possible evidence of presence of proliferative cartilage in this taxon.{{Cite journal|author1=Alfred Lemierre |author2=Damien Germain |year=2019 |title=A new mineralized tissue in the early vertebrate Astraspis |journal=Journal of Anatomy |volume=235 |issue=6 |pages=1105–1113 |doi=10.1111/joa.13070 |pmid=31355451 |pmc=6875941 }}
• A study on the anatomy of the circulatory system of the head of Shuyu is published by Gai, Zhu & Donoghue (2019).{{Cite journal|author1=Zhi-Kun Gai |author2=Min Zhu |author3=Philip C.J. Donoghue |year=2019 |title=The circulatory system of Galeaspida (Vertebrata; stem-Gnathostomata) revealed by synchrotron X-ray tomographic microscopy |journal=Palaeoworld |volume=28 |issue=4 |pages=441–460 |doi=10.1016/j.palwor.2019.04.005 |s2cid=150178031 |url=https://research-information.bris.ac.uk/en/publications/2e507a43-f4f9-4865-a633-e439446bb367 |hdl=1983/2e507a43-f4f9-4865-a633-e439446bb367 |hdl-access=free }}
• Redescription of Sinogaleaspis shankouensis, based on data from 11 new specimens from the Silurian Xikeng Formation (Jiangxi, China), is published online by Gai et al. (2019).{{Cite journal|author1=Zhi-Kun Gai |author2=Xian-Ren Shan |author3=Zhi-Xin Sun |author4=Wen-Jin Zhao |author5=Zhao-Hui Pan |author6=Min Zhu |year=2019 |title=A redescription of the Silurian Sinogaleaspis shankouensis (Galeaspida, stem-Gnathostomata) from Jiangxi, China |journal=Vertebrata PalAsiatica |volume=58 |issue=2 |pages=85–99 |doi=10.19615/j.cnki.1000-3118.191105 }}
• A study on the anatomy of the dermal skeleton of Tremataspis mammillata is published by O'Shea, Keating & Donoghue (2019).{{Cite journal|author1=James O'Shea |author2=Joseph N. Keating |author3=Philip C. J. Donoghue |year=2019 |title=The dermal skeleton of the jawless vertebrate Tremataspis mammillata (Osteostraci, stem-Gnathostomata) |journal=Journal of Morphology |volume=280 |issue=7 |pages=999–1025 |doi=10.1002/jmor.20997 |pmid=31066961 |hdl=1983/f400ec4c-3588-49cb-8ac5-3fcb90eaa593 |s2cid=147706213 |url=https://research-information.bris.ac.uk/en/publications/f400ec4c-3588-49cb-8ac5-3fcb90eaa593 |hdl-access=free }}
• Redescription of Asterolepis orcadensis based on newly collected fossil material is published by Newman, den Blaauwen & Leather (2019).{{cite journal |author1=Michael Newman |author2=Jan den Blaauwen |author3=David Leather |year=2019 |title=The antiarch fish Asterolepis orcadensis from the Scottish Middle Devonian |journal=Palaeontologia Electronica |volume=22 |issue=2 |pages=Article number 22.2.37 |doi=10.26879/970 |s2cid=198420651 |doi-access=free }}
• A study on the morphology of the jaw elements of a buchanosteoid placoderm specimen ANU V244 from the Early Devonian limestones (~400 Ma) at Burrinjuck, near Canberra (Australia) is published by Hu et al. (2019).{{Cite journal|author1=Yu-Zhi Hu |author2=G.C. Young |author3=Carole Burrow |author4=You-an Zhu |author5=Jing Lu |year=2019 |title=High resolution XCT scanning reveals complex morphology of gnathal elements in an Early Devonian arthrodire |journal=Palaeoworld |volume=28 |issue=4 |pages=525–534 |doi=10.1016/j.palwor.2018.12.003 |s2cid=135408881 }}
• A specimen of Dunkleosteus terrelli preserving vertebrae fused into a structure known as the synarcual is described from the Devonian Cleveland Shale Member of the Ohio Shale Formation (Ohio, United States) by Johanson et al. (2019).{{cite journal |author1=Zerina Johanson |author2=Kate Trinajstic |author3=Stephen Cumbaa |author4=Michael J. Ryan |year=2019 |title=Fusion in the vertebral column of the pachyosteomorph arthrodire Dunkleosteus terrelli ('Placodermi') |journal=Palaeontologia Electronica |volume=22 |issue=2 |pages=Article number 22.2.20 |doi=10.26879/872 |s2cid=162173408 |doi-access=free }}
• A redescription and a study on the phylogenetic relationships of a putative antiarch Silurolepis platydorsalis is published by Zhu, Lu & Zhu (2019), who reinterpret this species as a maxillate placoderm close to Qilinyu.{{cite journal |author1=You-an Zhu |author2=Jing Lu |author3=Min Zhu |year=2019 |title=Reappraisal of the Silurian placoderm Silurolepis and insights into the dermal neck joint evolution |journal=Royal Society Open Science |volume=6 |issue=9 |pages=Article ID 191181 |doi=10.1098/rsos.191181 |pmid=31598327 |pmc=6774982 |bibcode=2019RSOS....691181Z }}
• New body fossils of Cheiracanthus intricatus, including the first known articulated specimen of this species, are described from the Givetian Tordalen Formation (Spitsbergen, Norway) by Newman, Burrow & den Blaauwen (2019).{{Cite journal|author1=Michael J. Newman |author2=Carole J. Burrow |author3=Jan L. den Blaauwen |year=2019 |title=The Givetian vertebrate fauna from the Fiskekløfta Member (Mimerdalen Subgroup), Svalbard. Part I. Stratigraphic and faunal review. Part II. Acanthodii |journal=Norwegian Journal of Geology |volume=99 |issue=1 |pages=1–16 |url=http://njg.geologi.no/component/fabrik/details/1/2194-2194 |doi=10.17850/njg99-1-01 |s2cid=221652064 |doi-access=free }}
• A study on the anatomy of the skeletal elements of the pharynx of Ptomacanthus anglicus, and on its implications for the knowledge of the evolution of the pharynx of jawed vertebrates, is published by Dearden, Stockey & Brazeau (2019).{{Cite journal|author1=Richard P. Dearden |author2=Christopher Stockey |author3=Martin D. Brazeau |year=2019 |title=The pharynx of the stem-chondrichthyan Ptomacanthus and the early evolution of the gnathostome gill skeleton |journal=Nature Communications |volume=10 |issue=1 |pages=Article number 2050 |doi=10.1038/s41467-019-10032-3 |pmid=31053719 |pmc=6499890 |bibcode=2019NatCo..10.2050D }}
• Description of fossils of Carboniferous (Mississippian) cartilaginous fishes from the area of Krzeszowice (Poland) is published by Ginter & Złotnik (2019).{{Cite journal|author1=Michał Ginter |author2=Michał Złotnik |year=2019 |title=Mississippian chondrichthyan fishes from the area of Krzeszowice, southern Poland |journal=Acta Palaeontologica Polonica |volume=64 |issue=3 |pages=549–564 |doi=10.4202/app.00619.2019 |s2cid=213365272 |doi-access=free }}
• A study on microwear on teeth of Edestus minor, and on its implications for the knowledge of function of teeth of this fish, is published by Itano (2019).{{cite journal |author=Wayne M. Itano |year=2019 |title=Oriented microwear on a tooth of Edestus minor (Chondrichthyes, Eugeneodontiformes): Implications for dental function |journal=Palaeontologia Electronica |volume=22 |issue=2 |pages=Article number 22.2.39 |doi=10.26879/831 |s2cid=198421092 |doi-access=free }}
• A revision of species belonging to the genus Edestus is published by Tapanila & Pruitt (2019).{{cite journal |author1=Leif Tapanila |author2=Jesse Pruitt |year=2019 |title=Redefining species concepts for the Pennsylvanian scissor tooth shark, Edestus |journal=PLOS ONE |volume=14 |issue=9 |pages=e0220958 |doi=10.1371/journal.pone.0220958 |pmid=31483800 |pmc=6726245 |bibcode=2019PLoSO..1420958T |doi-access=free }}
• Discovery of a cast of the holotype of Petalodus ohioensis in the collections of the Yale Peabody Museum of Natural History is reported by Carpenter & Itano (2019), who consider the species Petalodus alleghaniensis to be a junior synonym of P. ohioensis.{{Cite journal |author1=Kenneth Carpenter |author2=Wayne M. Itano |year=2019 |title=Taxonomic validity of Petalodus ohioensis (Chondrichthyes, Petalodontidae) based on a cast of the lost holotype |journal=Geology of the Intermountain West |volume=6 |pages=55–60 |doi=10.31711/giw.v6.pp55-60 |s2cid=134168470 |doi-access=free }}
• Restudy of a putative bill of an ibis-like bird from the Eocene La Meseta Formation (Antarctica) described by Jadwiszczak, Gaździcki & Tatur (2008){{cite journal |author1=Piotr Jadwiszczak |author2=Andrzej Gaździcki |author3=Andrzej Tatur |year=2008 |title=An ibis-like bird from the Upper La Meseta Formation (Late Eocene) of Seymour Island, Antarctica |journal=Antarctic Science |volume=20 |issue=4 |pages=413–414 |doi=10.1017/S0954102008000977 |s2cid=128551334 }} is published by Agnolin, Bogan & Rozadilla (2019), who consider this specimen to be more likely to be a dorsal spine of a chimaeroid cartilaginous fish.{{cite journal |author1=Federico Lisandro Agnolin |author2=Sergio Bogan |author3=Sebastián Rozadilla |year=2019 |title=Were ibises (Aves, Threskiornithidae) present in Antarctica? |journal=Antarctic Science |volume=31 |issue=1 |pages=35–36 |doi=10.1017/S0954102018000512 |s2cid=134545946 }}
• A study on the anatomy of the skull of Tristychius arcuatus, providing evidence of adaptations for suction feeding, is published by Coates et al. (2019).{{Cite journal|author1=Michael I. Coates |author2=Kristen Tietjen |author3=Aaron M. Olsen |author4=John A. Finarelli |year=2019 |title=High-performance suction feeding in an early elasmobranch |journal=Science Advances |volume=5 |issue=9 |pages=eaax2742 |doi=10.1126/sciadv.aax2742 |pmid=31535026 |pmc=6739094 |bibcode=2019SciA....5.2742C }}
• Teeth of a hybodont shark belonging to the genus Asteracanthus, with anatomy indicative of a crushing feeding behaviour, are described from the Upper Jurassic deposits of the Monte Nerone Pelagic Carbonate Platform, in the Umbria-Marche-Sabina Palaeogeographic Domain (Italy) by Citton et al. (2019).{{Cite journal|author1=Paolo Citton |author2=Simone Fabbi |author3=Angelo Cipriani |author4=Maren Jansen |author5=Marco Romano |year=2019 |title=Hybodont dentition from the Upper Jurassic of Monte Nerone Pelagic Carbonate Platform (Umbria-Marche Apennine, Italy) and its ecological implications |journal=Geological Journal |volume=54 |issue=1 |pages=278–290 |doi=10.1002/gj.3174 |s2cid=134843247 |doi-access=free |bibcode=2019GeolJ..54..278C }}
• An association of 58 teeth of Ptychodus anonymus, representing the first occurrence of an associated dentition of this species, is described from the Cenomanian Jetmore Member of the Greenhorn Formation (Kansas, United States) by Hamm (2019).{{Cite journal|author=Shawn A. Hamm |year=2019 |title=First associated tooth set of Ptychodus anonymus (Elasmobranchii: Ptychodontidae) in North America from the Jetmore Chalk in Kansas |journal=Transactions of the Kansas Academy of Science |volume=122 |issue=1–2 |pages=1–18 |doi=10.1660/062.122.0101 |s2cid=164524395 }}
• Description of new associated skeletal remains of Ischyrhiza mira from the Upper Cretaceous of Tennessee and Alabama and a study on the paleobiology of this species is published by Sternes & Shimada (2019).{{Cite journal|author1=Phillip C. Sternes |author2=Kenshu Shimada |year=2019 |title=Paleobiology of the Late Cretaceous sclerorhynchid sawfish, Ischyrhiza mira (Elasmobranchii: Rajiformes), from North America based on new anatomical data |journal=Historical Biology: An International Journal of Paleobiology |volume=31 |issue=10 |pages=1323–1340 |doi=10.1080/08912963.2018.1452205 |s2cid=90291295 }}
• A study on the anatomy and phylogenetic relationships of Promyliobatis gazolai is published by Marramà et al. (2019).{{Cite journal|author1=Giuseppe Marramà |author2=Giorgio Carnevale |author3=Gavin J. P. Naylor |author4=Jürgen Kriwet |year=2019 |title=Mosaic of plesiomorphic and derived characters in an Eocene myliobatiform batomorph (Chondrichthyes, Elasmobranchii) from Italy defines a new, basal body plan in pelagic stingrays |journal=Zoological Letters |volume=5 |pages=Article 13 |doi=10.1186/s40851-019-0128-0 |pmid=31057944 |pmc=6485097 |doi-access=free }}
• Fossils of members of the genus Aetomylaeus are described from localities in Peru and Chile by Villafaña et al. (2019), representing the first unambiguous fossil record of this genus from the Neogene of the southeastern Pacific.{{Cite journal|author1=Jaime A. Villafaña |author2=Giuseppe Marramà |author3=Sebastian Hernandez |author4=Jorge D. Carrillo-Briceño |author5=Dirk Hovestadt |author6=Rene Kindlimann |author7=Jürgen Kriwet |year=2019 |title=The Neogene fossil record of Aetomylaeus (Elasmobranchii, Myliobatidae) from the south-eastern Pacific |journal=Journal of Vertebrate Paleontology |volume=39 |issue=1 |pages=e1577251 |doi=10.1080/02724634.2019.1577251 |pmid=31709025 |pmc=6817319 |bibcode=2019JVPal..39E7251V }}
• A specimen of the whiptail stingray species Tethytrygon muricatus preserving the uterus bearing four eggs is described from the Eocene of the Monte Bolca locality (Italy) by Fanti, Mazzuferi & Marramà (2019).{{Cite journal|author1=Federico Fanti |author2=Gabriele Mazzuferi |author3=Giuseppe Marramà |year=2019 |title=Egg preservation in an Eocene stingray (Myliobatiformes, Dasyatidae) from Italy |journal=Journal of Vertebrate Paleontology |volume=39 |issue=2 |pages=e1578967 |doi=10.1080/02724634.2019.1578967 |pmid=31709026 |pmc=6817316 |bibcode=2019JVPal..39E8967F }}
• Description of Langhian ray fossils from the Lower Tagus Basin (Portugal) is published by Fialho, Balbino & Antues (2019).{{Cite journal|author1=Pedro Fialho |author2=Ausenda Balbino |author3=Miguel Telles Antues |year=2019 |title=Langhian rays (Chondrichthyes, Batomorphii) from Brielas, Lower Tagus Basin, Portugal |journal=Geologica Acta |volume=17 |issue=7 |pages=1–16 |doi=10.1344/GeologicaActa2019.17.7 |s2cid=214506546 |doi-access=free |hdl=10174/26035 |hdl-access=free }}
• A study on the taxonomic status and geological age of large shark remains from the Upper Cretaceous of the Castellavazzo locality (Italy) discovered in the 19th century is published by Conte et al. (2019).{{Cite journal|author1=Gabriele Larocca Conte |author2=Federico Fanti |author3=Enrico Trevisani |author4=Paolo Guaschi |author5=Roberto Barbieri |author6=Mohamad Bazzi |year=2019 |title=Reassessment of a large lamniform shark from the Upper Cretaceous (Santonian) of Italy |journal=Cretaceous Research |volume=99 |pages=156–168 |doi=10.1016/j.cretres.2019.02.011 |bibcode=2019CrRes..99..156L |s2cid=135220712 }}
• 15 partial skeletons of lamniform sharks, including the largest specimen of Cretoxyrhina mantelli known to date, are described from the Upper Cretaceous Scaglia Rossa Formation (Italy) by Amalfitano et al. (2019), who also review the taxonomic history of C. mantelli.{{Cite journal|author1=Jacopo Amalfitano |author2=Luca Giusberti |author3=Eliana Fornaciari |author4=Fabio Marco Dalla Vecchia |author5=Valeria Luciani |author6=Jürgen Kriwet |author7=Giorgio Carnevale |year=2019 |title=Large deadfalls of the {{okina}}ginsuʼ shark Cretoxyrhina mantelli (Agassiz, 1835) (Neoselachii, Lamniformes) from the Upper Cretaceous of northeastern Italy |journal=Cretaceous Research |volume=98 |pages=250–275 |doi=10.1016/j.cretres.2019.02.003 |bibcode=2019CrRes..98..250A |hdl=11392/2402988 |s2cid=135196193 |url=https://ddd.uab.cat/record/215292 |hdl-access=free }}
• A study on teeth histology and mineralization pattern in lamniform sharks, based on data from extant and fossil taxa (including enigmatic galeomorph shark Palaeocarcharias stromeri), is published by Jambura et al. (2019).{{Cite journal|author1=Patrick L. Jambura |author2=René Kindlimann |author3=Faviel López-Romero |author4=Giuseppe Marramà |author5=Cathrin Pfaff |author6=Sebastian Stumpf |author7=Julia Türtscher |author8=Charlie J. Underwood |author9=David J. Ward |author10=Jürgen Kriwet |year=2019 |title=Micro-computed tomography imaging reveals the development of a unique tooth mineralization pattern in mackerel sharks (Chondrichthyes; Lamniformes) in deep time |journal=Scientific Reports |volume=9 |issue=1 |pages=Article number 9652 |doi=10.1038/s41598-019-46081-3 |pmid=31273249 |pmc=6609643 |bibcode=2019NatSR...9.9652J }}
• A study on changes of diversity of lamniform sharks throughout their evolutionary history, aiming to determine the causes of their decline in the last 20 million years, is published by Condamine, Romieu & Guinot (2019).{{Cite journal|author1=Fabien L. Condamine |author2=Jules Romieu |author3=Guillaume Guinot |year=2019 |title=Climate cooling and clade competition likely drove the decline of lamniform sharks |journal=Proceedings of the National Academy of Sciences of the United States of America |volume=116 |issue=41 |pages=20584–20590 |doi=10.1073/pnas.1902693116 |pmid=31548392 |pmc=6789557 |bibcode=2019PNAS..11620584C |doi-access=free }}
• A study on changes in the presence or absence of lateral cusplets on teeth of members of the genus Carcharocles from the Calvert, Choptank, and St. Marys formations, and on their implications for the transition of shark populations from these formations from a Carcharocles chubutensis-dominated population to one dominated by C. megalodon, is published by Perez et al. (2019).{{Cite journal|author1=Victor J. Perez |author2=Stephen J. Godfrey |author3=Bretton W. Kent |author4=Robert E. Weems |author5=John R. Nance |year=2019 |title=The transition between Carcharocles chubutensis and Carcharocles megalodon (Otodontidae, Chondrichthyes): lateral cusplet loss through time |journal=Journal of Vertebrate Paleontology |volume=38 |issue=6 |pages=e1546732 |doi=10.1080/02724634.2018.1546732 |s2cid=92407449 |doi-access=free }}
• A revision and a reevaluation of the reliability of all post-Messinian occurrences of Otodus megalodon in marine strata from western North America, and a study on the timing of extinction of this species, is published by Boessenecker et al. (2019).{{Cite journal|author1=Robert W. Boessenecker |author2=Dana J. Ehret |author3=Douglas J. Long |author4=Morgan Churchill |author5=Evan Martin |author6=Sarah J. Boessenecker |year=2019 |title=The Early Pliocene extinction of the mega-toothed shark Otodus megalodon: a view from the eastern North Pacific |journal=PeerJ |volume=7 |pages=e6088 |doi=10.7717/peerj.6088 |pmid=30783558 |pmc=6377595 |doi-access=free }}
• A study on the body size of Otodus megalodon, as inferred from the relationship between the ontogenetic development of teeth and total body length in the great white shark, is published by Shimada (2019).{{Cite journal|author=Kenshu Shimada |year=2019 |title=The size of the megatooth shark, Otodus megalodon (Lamniformes: Otodontidae), revisited |journal=Historical Biology: An International Journal of Paleobiology |volume=33 |issue=7 |pages=904–911 |doi=10.1080/08912963.2019.1666840 |s2cid=208570844 }}
• Partial forelimb of a rorqual with several shark bite marks is described from the Pliocene Burica Formation (Panama) by Cortés et al. (2019).{{cite journal |author1=Dirley Cortés |author2=Carlos De Gracia |author3=Jorge D. Carrillo-Briceño |author4=Gabriel Aguirre-Fernández |author5=Carlos Jaramillo |author6=Aldo Benites-Palomino |author7=Joaquín Enrique Atencio-Araúz |year=2019 |title=Shark-cetacean trophic interactions during the late Pliocene in the Central Eastern Pacific (Panama) |journal=Palaeontologia Electronica |volume=22 |issue=2 |pages=Article number 22.2.49 |doi=10.26879/953 |s2cid=201304252 |doi-access=free }}
• A study on the anatomy of the holotype specimen of a putative Paleocene shark Platyacrodus unicus is published by Bogan, Agnolin & Ezcurra (2019), who reinterpret this specimen as a carapace of a small retroplumid crab belonging to the genus Costacopluma.{{Cite journal|author1=Sergio Bogan |author2=Federico Agnolin |author3=Martín D. Ezcurra |year=2019 |title=Review of the enigmatic 'shark', Platyacrodus unicus Ameghino, 1935, from the Paleocene of Patagonia, Argentina: a history of palaeontologists, sharks and crabs |journal=Zootaxa |volume=4646 |issue=2 |pages=293–300 |doi=10.11646/zootaxa.4646.2.5 |pmid=31717016 |s2cid=199629925 }}
• An assemblage of well-preserved isolated teeth of elasmobranchs is described from the late Oligocene of the North Alpine Foreland Basin (Austria) by Feichtinger et al. (2019).{{Cite journal|author1=Iris Feichtinger |author2=Matthias Kranner |author3=Christian Rupp |author4=Mathias Harzhauser |year=2019 |title=A new outer neritic elasmobranch assemblage from the Egerian (late Oligocene) of the North Alpine Foreland Basin (Austria) |journal=Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen |volume=293 |issue=1 |pages=19–35 |doi=10.1127/njgpa/2019/0828 |s2cid=199091907 }}
• Description of the deep-sea elasmobranch fauna from the Miocene Yatsuo Group in central Japan, including the first fossil occurrences of the genera Arhynchobatis and Pseudoraja, will be published by Nishimatsu & Ujihara (2019).{{Cite journal|author1=Kouki Nishimatsu |author2=Atsushi Ujihara |year=2019 |title=Deep-sea elasmobranch fauna with the first descriptions of genera Arynchobatis and Pseudoraja from the Miocene Yatsuo group in Toyama, central Japan |journal=Historical Biology: An International Journal of Paleobiology |volume=32 |issue=8 |pages=1120–1142 |doi=10.1080/08912963.2019.1566325 |s2cid=92429706 }}
• Description of the deep-sea elasmobranch fossils from the Miocene Makino Formation in southwest Japan, including the first fossil occurrences of the genera Springeria and Narke, is published by Nishimatsu (2019).{{cite journal |author=Kouki Nishimatsu |year=2019 |title=Deep-sea elasmobranchs from the late early to middle Miocene (Burdigalian–Langhian) Makino Formation (Awa Group), Japan |journal=Journal of Vertebrate Paleontology |volume=39 |issue=2 |pages=e1597729 |doi=10.1080/02724634.2019.1597729 |bibcode=2019JVPal..39E7729N |s2cid=196688698 }}
• A study on Paleocene cartilaginous fish fossils from the Lower Clayton Limestone Unit of the Midway Group near Malvern, Arkansas, evaluating the implications of these fossils for the knowledge of cartilaginous fish diversity across the Cretaceous-Paleogene boundary in the Malvern region and Gulf Coastal Plain of southwestern Arkansas, is published online by Maisch, Becker & Griffiths (2019).{{cite journal |author1=Harry M. Maisch IV |author2=Martin A. Becker |author3=Michael L. Griffiths |year=2019 |title=Chondrichthyans from the Lower Clayton Limestone Unit of the Midway Group (Paleocene) near Malvern, Arkansas, USA, with comments on the K/Pg boundary |journal=PalZ |volume=94 |issue=3 |pages=561–593 |doi=10.1007/s12542-019-00494-7 |s2cid=208302039 }}
• A study on the morphology of scales and squamation pattern in Guiyu oneiros is published by Cui, Qiao & Zhu (2019).{{Cite journal|author1=Xindong Cui |author2=Tuo Qiao |author3=Min Zhu |year=2019 |title=Scale morphology and squamation pattern of Guiyu oneiros provide new insights into early osteichthyan body plan |journal=Scientific Reports |volume=9 |issue=1 |pages=Article number 4411 |doi=10.1038/s41598-019-40845-7 |pmid=30867533 |pmc=6416254 |bibcode=2019NatSR...9.4411C }}
• A study on the anatomy and phylogenetic relationships of Brazilichthys macrognathus is published by Figueroa, Friedman & Gallo (2019).{{Cite journal|author1=Rodrigo T. Figueroa |author2=Matt Friedman |author3=Valéria Gallo |year=2019 |title=Cranial anatomy of the predatory actinopterygian Brazilichthys macrognathus from the Permian (Cisuralian) Pedra de Fogo Formation, Parnaíba Basin, Brazil |journal=Journal of Vertebrate Paleontology |volume=39 |issue=3 |pages=e1639722 |doi=10.1080/02724634.2019.1639722 |bibcode=2019JVPal..39E9722F |s2cid=202030046 }}
• Permian species Palaeothrissum inaequilobum Blainville (1818) and P. parvum Blainville (1818) are found to be senior synonyms of the widely used species name Aeduella blainvillei (Agassiz, 1833) by Brignon (2019). Conditions exist for reversal of precedence and Aeduella blainvillei is declared nomen protectum.{{Cite journal |author=Arnaud Brignon |year=2019 |title=The nomenclatural status of Palaeothrissum inaequilobum Blainville, 1818, P. parvum Blainville, 1818, and Aeduella blainvillei (Agassiz, 1833) (Actinopterygii, Aeduellidae) |journal=Carnets de Géologie |volume=19 |issue=8 |pages=141–148 |doi=10.4267/2042/70290 |hdl=2042/70290 |s2cid=201081145 |doi-access=free }}
• A study on the anatomy of the jaws, palate and teeth of Eurynotus crenatus is published by Friedman et al. (2019).{{Cite journal|author1=Matt Friedman |author2=Stephanie E. Pierce |author3=Michael Coates |author4=Sam Giles |year=2019 |title=Feeding structures in the ray-finned fish Eurynotus crenatus (Actinopterygii: Eurynotiformes): implications for trophic diversification among Carboniferous actinopterygians |journal=Earth and Environmental Science Transactions of the Royal Society of Edinburgh |volume=109 |issue=1–2 |pages=33–47 |doi=10.1017/S1755691018000816 |s2cid=133954596 |url=https://ora.ox.ac.uk/objects/uuid:30dadbe0-b629-48f5-9ae5-faf415f7bb04 |url-access=subscription }}
• New specimen of Birgeria liui, representing the most complete and articulated postcranial skeleton of an adult specimen of Birgeria reported so far, is described from the Ladinian of South China by Ni et al. (2019).{{Cite journal|author1=Peigang Ni |author2=Andrea Tintori |author3=Zuoyu Sun |author4=Cristina Lombardo |author5=Dayong Jiang |year=2019 |title=Postcranial skeleton of Birgeria liui (Osteichthyes, Actinopterygii) from the Longobardian (Ladinian, Middle Triassic) of Xingyi, Guizhou, South China |journal=Swiss Journal of Geosciences |volume=112 |issue=2–3 |pages=307–324 |doi=10.1007/s00015-018-0329-0 |s2cid=135305199 }}
• Fossil remains of a spiral valve are reported in a specimen of Peipiaosteus pani from the Lower Cretaceous Yixian Formation (China) by Capasso (2019).{{Cite journal|author=Luigi Capasso |year=2019 |title=First direct evidence of the spiral valve intestine of sturgeons in an exceptionally well preserved early Cretaceous fossil |journal=Bollettino del Museo Civico di Storia Naturale di Verona |volume=43 |pages=23–27 |url=https://museodistorianaturale.comune.verona.it/media/_Musei/_StoriaNaturale/_Allegati/Biblioteca/Bollettino/Bollettino%2043(2019)/23-27_Capasso.pdf }}
• Teeth of members of the genus Pycnodus are described from the Upper Cretaceous Cap de Naze marine formation (Senegal) by Capasso (2019).{{Cite journal|author=Luigi Capasso |year=2019 |title=Presence of Pycnodontids (Pisces, Actinopterygii) in the Late Cretaceous Cap de Naze marine formation, at Popenguine Cliff, Senegal (Central Africa) |journal=Bollettino del Museo Civico di Storia Naturale di Verona |volume=43 |pages=37–41 |url=https://museodistorianaturale.comune.verona.it/media/_Musei/_StoriaNaturale/_Allegati/Biblioteca/Bollettino/Bollettino%2043(2019)/37-41_Capasso.pdf }}
• Description of a partial skeleton of Micropycnodon kansasensis from the Smoky Hill Chalk Member of the Niobrara Chalk (Kansas, United States), providing new information on the anatomy of this species, is published by Cronin & Shimada (2019).{{Cite journal|author1=Timothy J. Cronin |author2=Kenshu Shimada |year=2019 |title=New anatomical information on the Late Cretaceous bony fish, Micropycnodon kansasensis (Actinopterygii: Pycnodontiformes), from the Niobrara Chalk of western Kansas, U.S.A. |journal=Transactions of the Kansas Academy of Science |volume=122 |issue=1–2 |pages=19–28 |doi=10.1660/062.122.0102 |s2cid=164914313 }}
• A study on the paleobiology of specimens of Nursallia gutturosum from the Cenomanian-Turonian platy limestone deposit of Vallecillo (north-eastern Mexico) is published by Stinnesbeck, Rust & Herder (2019).{{Cite journal|author1=Eva Susanne Stinnesbeck |author2=Jes Rust |author3=Fabian Herder |year=2019 |title=Paleobiology and taphonomy of the pycnodont fish Nursallia gutturosum, based on material from the Latest-Cenomanian-middle Turonian Vallecillo platy limestone, Mexico |journal=PalZ |volume=93 |issue=4 |pages=659–668 |doi=10.1007/s12542-019-00461-2 |bibcode=2019PalZ...93..659S |s2cid=197575750 }}
• A study on the anatomy and phylogenetic relationships of Robustichthys luopingensis is published by Xu (2019).{{Cite journal|author=Guang-Hui Xu |year=2019 |title=Osteology and phylogeny of Robustichthys luopingensis, the largest holostean fish in the Middle Triassic |journal=PeerJ |volume=7 |pages=e7184 |doi=10.7717/peerj.7184 |pmid=31275762 |pmc=6596411 |doi-access=free }}
• Fossil teeth representing the first evidence of Late Jurassic ginglymodians from Mt. Nerone in the Umbria-Marche-Sabina Domain (Italy) are described by Romano et al. (2019).{{Cite journal|author1=Marco Romano |author2=Angelo Cipriani |author3=Simone Fabbi |author4=Paolo Citton |year=2019 |title=First remains of neoginglymodian actinopterygians from the Jurassic of Monte Nerone area (Umbria-Marche Apennine, Italy) |journal=Italian Journal of Geosciences |volume=138 |issue=1 |pages=88–102 |doi=10.3301/IJG.2018.28 |hdl=11336/125811 |s2cid=133831748 |hdl-access=free }}
• A study on the anatomy and phylogenetic relationships of "Lepidotes" bernissartensis is published online by Cavin, Deesri & Olive (2019), who transfer this species to the genus Scheenstia.{{Cite journal|author1=Lionel Cavin |author2=Uthumporn Deesri |author3=Sébastien Olive |year=2019 |title=Scheenstia bernissartensis (Actinopterygii: Ginglymodi) from the Early Cretaceous of Bernissart, Belgium, with an appraisal of ginglymodian evolutionary history |journal=Journal of Systematic Palaeontology |volume=18 |issue=6 |pages=513–527 |doi=10.1080/14772019.2019.1634649 |s2cid=199631685 }}
• A study on the internal anatomy of a left jaw of a member of the genus Scheenstia from the Kimmeridgian Reuchenette Formation (Switzerland) is published online by Leuzinger et al. (2019), who describe a peculiar tooth replacement mode in this specimen.{{Cite journal|author1=Léa Leuzinger |author2=Lionel Cavin |author3=Adriana López-Arbarello |author4=Jean-Paul Billon-Bruyat |year=2019 |title=Peculiar tooth renewal in a Jurassic ray-finned fish (Lepisosteiformes, †Scheenstia sp.) |journal=Palaeontology |volume=63 |issue=1 |pages= 117–129|doi=10.1111/pala.12446 |s2cid=204265568 |doi-access=free }}
• A study on the stomach contents of two specimens of Lepidotes from the Lower Jurassic of Germany is published online by Thies, Stevens & Stumpf (2019).{{Cite journal|author1=Detlev Thies |author2=Kevin Stevens |author3=Sebastian Stumpf |year=2019 |title=Stomach contents of the Early Jurassic fish †Lepidotes Agassiz, 1832 (Actinopterygii, Lepisosteiformes) and their palaeoecological implications |journal=Historical Biology: An International Journal of Paleobiology |volume=33 |issue=6 |pages=868–879 |doi=10.1080/08912963.2019.1665040 |s2cid=203892069 }}
• Six new occurrences of Belonostomus, documenting the biogeographic and biostratigraphic range of this genus in North America, are reported from the Upper Cretaceous of Texas, Alabama and Mississippi by Van Vranken, Fielitz & Ebersole (2019).{{cite journal |author1=Nathan E. Van Vranken |author2=Christopher Fielitz |author3=Jun A. Ebersole |year=2019 |title=New occurrences of Belonostomus (Teleostomorpha: Aspidorhynchidae) from the Late Cretaceous of the North American Gulf Coastal Plain, USA |journal=Palaeontologia Electronica |volume=22 |issue=3 |pages=Article number 22.3.58 |doi=10.26879/983 |s2cid=204264731 |doi-access=free }}
• A study on the diversity of pectoral fin shape amongst members of Pachycormiformes is published by Liston et al. (2019).{{Cite journal|author1=Jeff J. Liston |author2=Anthony E. Maltese |author3=Paul H. Lambers |author4=Dominique Delsate |author5=William E.H. Harcourt-Smith |author6=Anneke H. van Heteren |year=2019 |title=Scythes, sickles and other blades: defining the diversity of pectoral fin morphotypes in Pachycormiformes |journal=PeerJ |volume=7 |pages=e7675 |doi=10.7717/peerj.7675 |pmid=31720097 |pmc=6842561 |doi-access=free }}
• A study on the anatomy of the skull of Martillichthys renwickae is published online by Dobson et al. (2019).{{Cite journal|author1=Claire Dobson |author2=Sam Giles |author3=Zerina Johanson |author4=Jeff Liston |author5=Matt Friedman |year=2019 |title=Cranial osteology of the Middle Jurassic (Callovian) Martillichthys renwickae (Neopterygii, Pachycormiformes) with comments on the evolution and ecology of edentulous pachycormiforms |journal=Papers in Palaeontology |volume=7 |issue=1 |pages=111–136 |doi=10.1002/spp2.1276 |hdl=2027.42/167090 |s2cid=202919395 |url=https://ora.ox.ac.uk/objects/uuid:e93fadf1-93da-4727-aad7-beeeacd09657 |hdl-access=free }}
• Fossil remains of a member or a relative of the genus Asthenocormus are described from the Upper Jurassic of the Ameghino (= Nordenskjöld) Formation of the Antarctic Peninsula by Gouiric-Cavalli et al. (2019), representing the first record of a suspension-feeding pachycormid from the Upper Jurassic of the Antarctic Peninsula and the oldest pachycormid yet recovered from Antarctica.{{Cite journal|author1=Soledad Gouiric-Cavalli |author2=Luciano L. Rasia |author3=Gonzalo J. Márquez |author4=Vilma Rosato, Roberto A. Scasso & Marcelo Reguero |year=2019 |title=First pachycormiform (Actinopterygii, Pachycormiformes) remains from the Late Jurassic of the Antarctic Peninsula and remarks on bone alteration by recent bioeroders |journal=Journal of Vertebrate Paleontology |volume=38 |issue=5 |pages=e1524384 |doi=10.1080/02724634.2018.1524384 |hdl=11336/117161 |s2cid=92170730 |url=https://figshare.com/articles/journal_contribution/7713440 |hdl-access=free }}
• New, three-dimensionally preserved specimens of Pachycormus are described from the Toarcian of Strawberry Bank at Ilminster (Somerset, United Kingdom) by Cawley et al. (2019).{{Cite journal|author1=John J. Cawley |author2=Jürgen Kriwet |author3=Stefanie Klug |author4=Michael J. Benton |year=2019 |title=The stem group teleost Pachycormus (Pachycormiformes: Pachycormidae) from the Upper Lias (Lower Jurassic) of Strawberry Bank, UK |journal=PalZ |volume=93 |issue=2 |pages=285–302 |doi=10.1007/s12542-018-0431-7 |s2cid=91258610 |doi-access=free |bibcode=2019PalZ...93..285C |hdl=1983/1a98e5d7-53a8-4f69-b1cd-64c284303128 |hdl-access=free }}
• A study on the anatomy of Pleuropholis decastroi from the Lower Cretaceous (Albian) limestones of Pietraroja (Province of Benevento, Italy) and on the phylogenetic relationships of the family Pleuropholidae is published by Taverne & Capasso (2019).{{Cite journal|author1=Louis Taverne |author2=Luigi Capasso |year=2019 |title=New data on Pleuropholis decastroi (Teleostei, Pleuropholidae), a "pholidophoriform" fish from the Lower Cretaceous of the Eurafrican Mesogea |journal=Geo-Eco-Trop |volume=43 |issue=1 |pages=35–51 |url=http://www.geoecotrop.be/uploads/publications/pub_431_03.pdf }}
• A study on the anatomy and phylogenetic relationships of the teleost species Majokia brasseuri from the Middle Jurassic Stanleyville Formation (Democratic Republic of the Congo) is published by Taverne (2019), who names a new order Majokiiformes.{{Cite journal|author=Louis Taverne |year=2019 |title=Osteology and phylogenetic relationships of Majokia brasseuri (Teleostei, Majokiiformes nov. ord.) from the continental Middle Jurassic (Stanleyville Formation) of Kisangani (Democratic Republic of Congo) |journal=Geo-Eco-Trop |volume=43 |issue=1 |pages=75–88 |url=http://www.geoecotrop.be/uploads/publications/pub_431_05.pdf }}
• A study on the anatomy, jaw mechanics and phylogenetic relationships of Dugaldia emmilta is published by Cavin & Berrell (2019).{{Cite journal|author1=Lionel Cavin |author2=Rodney W. Berrell |year=2019 |title=Revision of Dugaldia emmilta (Teleostei, Ichthyodectiformes) from the Toolebuc Formation, Albian of Australia, with comments on the jaw mechanics |journal=Journal of Vertebrate Paleontology |volume=39 |issue=1 |pages=e1576049 |doi=10.1080/02724634.2019.1576049 |bibcode=2019JVPal..39E6049C |s2cid=190880286 }}
• A juvenile specimen of Xiphactinus audax, representing the smallest specimen of this species reported so far, will be described from the Cretaceous Niobrara Chalk (Kansas, United States) by King & Super (2019).{{Cite journal|author1=James L. King |author2=Kristopher J. Super |year=2019 |title=The smallest recorded specimen of Xiphactinus audax from the Niobrara Chalk of Kansas and its implications for juvenile ichthyodectid ecology |journal=Historical Biology: An International Journal of Paleobiology |volume=33 |issue=4 |pages=441–445 |doi=10.1080/08912963.2019.1623212 |s2cid=191146942 }}
• A study on the internal structure of a fossil specimen of Notelops brama, investigated by neutron tomography, is published by Pugliesi et al. (2019).{{Cite journal|author1=Reynaldo Pugliesi |author2=Marco A. Stanojev Pereira |author3=Marcos L.G. Andrade |author4=Juliana M.L. Basso |author5=Cibele G. Voltani |author6=Ivone C. Gonzales |year=2019 |title=Study of the fish fossil Notelops brama from Araripe-Basin Brazil by Neutron Tomography |journal=Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |volume=919 |pages=68–72 |doi=10.1016/j.nima.2018.12.001 |bibcode=2019NIMPA.919...68P |s2cid=125618029 }}
• A study on the anatomy and phylogenetic relationships of Cavenderichthys talbragarensis and Waldmanichthys koonwarri is published online by Bean & Arratia (2019).{{cite journal |author1=Lynne B. Bean |author2=Gloria Arratia |year=2019 |title=Anatomical revision of the Australian teleosts Cavenderichthys talbragarensis and Waldmanichthys koonwarri impacting on previous phylogenetic interpretations of teleostean relationships |journal=Alcheringa: An Australasian Journal of Palaeontology |volume=44 |issue=1 |pages=121–159 |doi=10.1080/03115518.2019.1666921 |s2cid=210298837 }}
• A study on fossils of members of the genus Capoeta from the Pliocene locality Çevirme (Turkey) and on the evolutionary history of this genus is published by Ayvazyan, Vasilyan & Böhme (2019).{{cite journal |author1=Anna Ayvazyan |author2=Davit Vasilyan |author3=Madelaine Böhme |year=2019 |title=Possible species-flock scenario for the evolution of the cyprinid genus Capoeta (Cypriniformes: Cyprinidae) within late Neogene lake systems of the Armenian Highland |journal=PLOS ONE |volume=14 |issue=5 |pages=e0215543 |doi=10.1371/journal.pone.0215543 |pmid=31067236 |pmc=6505951 |bibcode=2019PLoSO..1415543A |doi-access=free }}
• Evidence of presence of managed aquaculture of the common carp by around 6000 BC is reported from the Early Neolithic Jiahu site (China) by Nakajima et al. (2019).{{Cite journal|author1=Tsuneo Nakajima |author2=Mark J. Hudson |author3=Junzo Uchiyama |author4=Keisuke Makibayashi |author5=Juzhong Zhang |year=2019 |title=Common carp aquaculture in Neolithic China dates back 8,000 years |journal=Nature Ecology & Evolution |volume=3 |issue=10 |pages=1415–1418 |doi=10.1038/s41559-019-0974-3 |pmid=31527727 |bibcode=2019NatEE...3.1415N |s2cid=202579732 }}
• A study on the morphology of fossil catfish spines from the Upper Cretaceous Adamantina and Marilia formations (Brazil) is published by Alves, Bergqvist & Brito (2019).{{Cite journal|author1=Y.M. Alves |author2=L.P. Bergqvist |author3=P.M. Brito |year=2019 |title=The dorsal and pectoral fin spines of catfishes (Ostariophysi: Siluriformes) from the Bauru Group (Late Cretaceous), Brazil: A comparative and critical analysis |journal=Journal of South American Earth Sciences |volume=92 |pages=32–40 |doi=10.1016/j.jsames.2019.02.016 |bibcode=2019JSAES..92...32A |s2cid=133688402 }}
• A study on positions, heading directions and possible behavioural rules used in a group of fossil specimens of Erismatopterus levatus from the Eocene Green River Formation is published by Mizumoto, Miyata & Pratt (2019).{{Cite journal|author1=Nobuaki Mizumoto |author2=Shinya Miyata |author3=Stephen C. Pratt |year=2019 |title=Inferring collective behaviour from a fossilized fish shoal |journal=Proceedings of the Royal Society B: Biological Sciences |volume=286 |issue=1903 |pages=Article ID 20190891 |doi=10.1098/rspb.2019.0891 |pmid=31138077 |pmc=6545072 }}
• Description of gadiform fossils from the Eocene sediments of the Sverdlovsk and Tyumen regions (Ural and Western Siberia, Russia), including fossils of members of the family Merlucciidae, is published by Marramà et al. (2019).{{Cite journal|author1=Giuseppe Marramà |author2=Giorgio Carnevale |author3=Pavel V. Smirnov |author4=Yaroslav S. Trubin |author5=Jürgen Kriwet |year=2019 |title=First report of Eocene gadiform fishes from the Trans-Urals (Sverdlovsk and Tyumen regions, Russia) |journal=Journal of Paleontology |volume=93 |issue=5 |pages=1001–1009 |doi=10.1017/jpa.2019.15 |bibcode=2019JPal...93.1001M |s2cid=146234827 |doi-access=free }}
• Description of an incomplete percomorph specimen from the Miocene Ixtapa Formation (Mexico), representing the oldest primary freshwater percomorph fish from Mexico reported so far, is published by Cantalice & Alvarado-Ortega (2019).{{Cite journal|author1=Kleyton M. Cantalice |author2=Jesús Alvarado-Ortega |year=2019 |title=The first occurrence of a fresh water percomorph fish (Actinopterygii: Teleostei) in the Ixtapa Formation (Miocene), Chiapas, southeastern Mexico |journal=Boletín de la Sociedad Geológica Mexicana |volume=71 |issue=3 |pages=831–839 |doi=10.18268/BSGM2019v71n3a12 |s2cid=204749022 |doi-access=free }}
• A study on the evolutionary history of the fish clade Pelagiaria is published by Friedman et al. (2019).{{Cite journal|author1=Matt Friedman |author2=Kara L. Feilich |author3=Hermione T. Beckett |author4=Michael E. Alfaro |author5=Brant C. Faircloth |author6=David Černý |author7=Masaki Miya |author8=Thomas J. Near |author9=Richard C. Harrington |year=2019 |title=A phylogenomic framework for pelagiarian fishes (Acanthomorpha: Percomorpha) highlights mosaic radiation in the open ocean |journal=Proceedings of the Royal Society B: Biological Sciences |volume=286 |issue=1910 |pages=Article ID 20191502 |doi=10.1098/rspb.2019.1502 |pmid=31506051 |pmc=6742994 }}
• A revision of the nomenclature of extant and fossil barracudas is published by Ballen (2019).{{Cite journal|author=Gustavo A. Ballen |year=2019 |title=Nomenclature of the Sphyraenidae (Teleostei: Carangaria): A synthesis of fossil- and extant-based classification systems |journal=Zootaxa |volume=4686 |issue=3 |pages=397–408 |doi=10.11646/zootaxa.4686.3.5 |pmid=31719480 |s2cid=207936606 }}
• A review of the published fossil record of the family Labridae is published by Bellwood et al. (2019).{{Cite journal|author1=David R. Bellwood |author2=Ortwin Schultz |author3=Alexandre C. Siqueira |author4=Peter F. Cowman |year=2019 |title=A review of the fossil record of the Labridae |journal=Annalen des Naturhistorischen Museums in Wien, Serie A |volume=121 |pages=125–193 |url=http://verlag.nhm-wien.ac.at/pdfs/121A_125193_Bellwood.pdf |jstor=26595690 }}
• A study on the feeding habits of the percomorph fish Rhenanoperca minuta and other fishes from the Eocene Messel pit (Germany) is published by Micklich, Baranov & Wappler (2019).{{Cite journal|author1=Norbert Micklich |author2=Viktor Baranov |author3=Torsten Wappler |year=2019 |title=New information on the feeding habits of the percomorph Rhenanoperca minuta, together with a short look at other fish species from the Eocene Messel Formation of Germany |journal=Bulletin of Geosciences |volume=94 |issue=3 |pages=315–336 |doi=10.3140/bull.geosci.1722 |s2cid=219151500 |doi-access=free }}
• A study on the phylogenetic relationships of "psarolepid" bony fishes, evaluating which characters cause their different placements in analyses utilizing different methods for reconstructing the tree of life, is published by King (2019).{{Cite journal|author=Benedict King |year=2019 |title=Which morphological characters are influential in a Bayesian phylogenetic analysis? Examples from the earliest osteichthyans |journal=Biology Letters |volume=15 |issue=7 |pages=Article ID 20190288 |doi=10.1098/rsbl.2019.0288 |pmid=31311486 |pmc=6684994 }}
• A study on the ontogeny of the neurocranium and brain in the West Indian Ocean coelacanth, and on its implications for the knowledge of the evolution of the head of lobe-finned fishes, is published by Dutel et al. (2019).{{Cite journal|author1=Hugo Dutel |author2=Manon Galland |author3=Paul Tafforeau |author4=John A. Long |author5=Michael J. Fagan |author6=Philippe Janvier |author7=Anthony Herrel |author8=Mathieu D. Santin |author9=Gaël Clément |author10=Marc Herbin |year=2019 |title=Neurocranial development of the coelacanth and the evolution of the sarcopterygian head |journal=Nature |volume=569 |issue=7757 |pages=556–569 |doi=10.1038/s41586-019-1117-3 |pmid=30996349 |bibcode=2019Natur.569..556D |s2cid=119539477 |url=https://hull-repository.worktribe.com/output/1811914 }}
• Redescription of Axelrodichthys araripensis and a comparative study of several other members of Mawsoniidae is published by Fragoso, Brito & Yabumoto (2019), who transfer the species Mawsonia lavocati to the genus Axelrodichthys.{{Cite journal|author1=Léo Galvão Carnier Fragoso |author2=Paulo Brito |author3=Yoshitaka Yabumoto |year=2019 |title=Axelrodichthys araripensis Maisey, 1986 revisited |journal=Historical Biology: An International Journal of Paleobiology |volume=31 |issue=10 |pages=1350–1372 |doi=10.1080/08912963.2018.1454443 |s2cid=89795160 |url=https://figshare.com/articles/dataset/_i_Axelrodichthys_araripensis_i_Maisey_1986_revisited/6031925 |url-access=subscription }}
• A study on the phylogenetic relationships and evolutionary history of mawsoniid coelacanths is published by Cavin et al. (2019).{{Cite journal|author1=Lionel Cavin |author2=Camila Cupello |author3=Yoshitaka Yabumoto |author4=Léo Fragoso |author5=Uthumporn Deesri |author6=Paulo M. Brito |year=2019 |title=Phylogeny and evolutionary history of mawsoniid coelacanths |journal=Bulletin of the Kitakyushu Museum of Natural History and Human History Series A (Natural History) |volume=17 |pages=3–13 |url=https://www.researchgate.net/publication/332380486 }}
• A study on the skull anatomy of Arquatichthys porosus, focusing on a newly-discovered postparietal shield, is published by Lu & Zhu (2019).{{Cite journal|author1=Jing Lu |author2=Min Zhu |year=2019 |title=The postparietal shield of the Pragian dipnomorph Arquatichthys and its implications for the rhipidistian cranial anatomy |journal=Palaeoworld |volume=28 |issue=4 |pages=543–549 |doi=10.1016/j.palwor.2019.07.004 |s2cid=199108003 }}
• Description of the posterior part of the skull of Tungsenia paradoxa is published by Lu et al. (2019).{{Cite journal|author1=Jing Lu |author2=Gavin Young |author3=Yu-Zhi Hu |author4=Tuo Qiao |author5=Min Zhu |year=2019 |title=The posterior cranial portion of the earliest known Tetrapodomorph Tungsenia paradoxa and the early evolution of tetrapodomorph endocrania |journal=Vertebrata PalAsiatica |volume=57 |issue=2 |pages=93–104 |doi=10.19615/j.cnki.1000-3118.181031 |url=http://www.ivpp.cas.cn/cbw/gjzdwxb/xbwzxz/201811/t20181103_5160016.html }}
• New fossil material of "Holoptychius" radiatus Newberry (1889) from the Devonian (Famennian) Catskill Formation (Pennsylvania, United States), providing new information on the anatomy of this species, is described by Daeschler, Downs & Matzko (2019), who transfer this species to the tristichopterid genus Langlieria.{{Cite journal|author1=Edward B. Daeschler |author2=Jason P. Downs |author3=Chelsea Matzko |year=2019 |title=New material supports a description and taxonomic revision of Holoptychius ? radiatus (Sarcopterygii, Tristichopteridae) from the Upper Devonian Catskill Formation in Pennsylvania, USA |journal=Proceedings of the Academy of Natural Sciences of Philadelphia |volume=167 |issue=1 |pages=11–25 |doi=10.1635/053.167.0102 |s2cid=164596190 }}
• A study on the bone histology of the humerus of Hyneria lindae is published by Kamska et al. (2019).{{Cite journal|author1=Viktoriia Kamska |author2=Edward B. Daeschler |author3=Jason P. Downs |author4=Per E. Ahlberg |author5=Paul Tafforeau |author6=Sophie Sanchez |year=2019 |title=Long-bone development and life-history traits of the Devonian tristichopterid Hyneria lindae |journal=Earth and Environmental Science Transactions of the Royal Society of Edinburgh |volume=109 |issue=1–2 |pages=75–86 |doi=10.1017/S175569101800083X |s2cid=134090370 }}
• Description of new fossil material of Edenopteron from the Devonian (Famennian) Worange Point Formation (Australia) and a study on the phylogenetic relationships of this taxon is published online by Young et al. (2019).{{cite journal |author1=G. C. Young |author2=R. L. Dunstone |author3=P. J. Ollerenshaw |author4=J. Lu |author5=B. Crook |year=2019 |title=New information on the giant Devonian lobe-finned fish Edenopteron from the New South Wales south coast |journal=Australian Journal of Earth Sciences |volume=67 |issue=2 |pages= 221–242|doi=10.1080/08120099.2019.1651769 |s2cid=204251345 }}
• A study on the anatomy of the shoulder girdle and opercular series of Gogonasus andrewsae is published by Hu, Young & Lu (2019).{{Cite journal|author1=Yuzhi Hu |author2=Gavin C. Young |author3=Jing Lu |year=2019 |title=The Upper Devonian tetrapodomorph Gogonasus andrewsae from Western Australia: reconstruction of the shoulder girdle and opercular series using X-ray Micro-Computed Tomography |journal=Palaeoworld |volume=28 |issue=4 |pages=535–542 |doi=10.1016/j.palwor.2019.07.008 |s2cid=200076100 }}
• A historical review of the fossil record of Devonian tetrapods and basal tetrapodomorphs from East Gondwana (Australasia, Antarctica) is published by Long, Clement & Choo (2019), who also present preliminary findings on the anatomy of the canowindrid Koharalepis jarviki based on synchrotron scan data.{{Cite journal|author1=John A. Long |author2=Alice M. Clement |author3=Brian Choo |year=2019 |title=New insights into the origins and radiation of the mid-Palaeozoic Gondwanan stem tetrapods |journal=Earth and Environmental Science Transactions of the Royal Society of Edinburgh |volume=109 |issue=1–2 |pages=139–155 |doi=10.1017/S1755691018000750 |s2cid=135325133 }}
• A study on the anatomy of fossil coelacanth lungs, on accessory air-breathing structures in fossil fishes and stem-tetrapods, and on the evolution of air breathing is published by Cupello, Clément & Brito (2019).{{cite book |author1=Camilla Cupello |author2=Gäel Clément |author3=Paulo M. Brito |year=2019 |chapter=Evolution of air breathing and lung distribution among fossil fishes |editor1=Zerina Johanson |editor2=Charlie Underwood |editor3=Martha Richter |title=Evolution and development of fishes |publisher=Cambridge University Press |pages=252–262 |doi=10.1017/9781316832172.016 |isbn=978-1-107-17944-8 |s2cid=91583226 }}
• A study on patterns of tooth replacement in Onychodus jandemarrai, Eusthenopteron foordi, Tiktaalik roseae and in extant West Indian Ocean coelacanth is published by Doeland et al. (2019).{{cite journal |author1=Mark Doeland |author2=Aidan M. C. Couzens |author3=Philip C. J. Donoghue |author4=Martin Rücklin |year=2019 |title=Tooth replacement in early sarcopterygians |journal=Royal Society Open Science |volume=6 |issue=11 |pages=Article ID 191173 |doi=10.1098/rsos.191173 |pmid=31827852 |pmc=6894600 |bibcode=2019RSOS....691173D }}
• A study on changes of the skeletal anatomy of the pelvic and pectoral appendages during the transition from fins to limbs in vertebrate evolution, as indicated by data from fossil lobe-finned fishes and early tetrapods, is published by Esteve-Altava et al. (2019).{{Cite journal|author1=Borja Esteve-Altava |author2=Stephanie E. Pierce |author3=Julia L. Molnar |author4=Peter Johnston |author5=Rui Diogo |author6=John R. Hutchinson |year=2019 |title=Evolutionary parallelisms of pectoral and pelvic network-anatomy from fins to limbs |journal=Science Advances |volume=5 |issue=5 |pages=eaau7459 |doi=10.1126/sciadv.aau7459 |pmid=31086814 |pmc=6506248 |bibcode=2019SciA....5.7459E }}
• A study on the anatomy of dermal rays in pectoral fins of Sauripterus taylori, Eusthenopteron foordi and Tiktaalik roseae, evaluating its implications for the knowledge of the evolution of dermal rays in early members of Tetrapodomorpha prior to the origin of digits, is published online by Stewart et al. (2019).{{Cite journal|author1=Thomas A. Stewart |author2=Justin B. Lemberg |author3=Natalia K. Taft |author4=Ihna Yoo |author5=Edward B. Daeschler |author6=Neil H. Shubin |year=2019 |title=Fin ray patterns at the fin-to-limb transition |journal=Proceedings of the National Academy of Sciences of the United States of America |volume=117 |issue=3 |pages= 1612–1620|doi=10.1073/pnas.1915983117 |pmid=31888998 |pmc=6983361 |doi-access=free }}
• A study on the evolution of the branchiostegal ray series in the skull of bony fishes, as indicated by data from extant and fossil taxa, is published by Ascarrunz et al. (2019).{{Cite journal|author1=Eduardo Ascarrunz |author2=Marcelo R. Sánchez-Villagra |author3=Ricardo Betancur-R |author4=Michel Laurin |year=2019 |title=On trends and patterns in macroevolution: Williston's law and the branchiostegal series of extant and extinct osteichthyans |journal=BMC Evolutionary Biology |volume=19 |issue=1 |pages=Article 117 |doi=10.1186/s12862-019-1436-x |pmid=31182024 |pmc=6558815 |doi-access=free |bibcode=2019BMCEE..19..117A }}
• A study on the origin and evolution of acellular bone (bone without osteocytes) in fossil and extant actinopterygian fishes is published by Davesne et al. (2019).{{Cite journal|author1=Donald Davesne |author2=François J. Meunier |author3=Armin D. Schmitt |author4=Matt Friedman |author5=Olga Otero |author6=Roger B. J. Benson |year=2019 |title=The phylogenetic origin and evolution of acellular bone in teleost fishes: insights into osteocyte function in bone metabolism |journal=Biological Reviews |volume=94 |issue=4 |pages=1338–1363 |doi=10.1111/brv.12505 |pmid=30924235 |hdl=2027.42/150563 |s2cid=85565690 |hdl-access=free }}
• A diverse fish assemblage is reported from the Carboniferous (upper Pennsylvanian) Horquilla Formation (New Mexico, United States) by Ivanov & Lucas (2019).{{Cite journal|author1=Alexander O. Ivanov |author2=Spencer G. Lucas |year=2019 |title=Late Pennsylvanian fish assemblage from the Robledo Mountains and new records of Paleozoic chondrichthyans in New Mexico, USA |journal=Bulletin of Geosciences |volume=94 |issue=2 |pages=235–255 |doi=10.3140/bull.geosci.1741 |s2cid=219272559 |doi-access=free }}
• A study on the diversity and ecology of Triassic fish assemblages from the Villány Hills (Hungary) is published by Szabó, Botfalvai & Osi (2019).{{Cite journal|author1=Márton Szabó |author2=Gábor Botfalvai |author3=Attila Osi |year=2019 |title=Taxonomical and palaeoecological investigations of the chondrichthyan and osteichthyan fish remains from the Middle-Late Triassic deposits of the Villány Hills (Southern Hungary) |journal=Geobios |volume=57 |pages=111–126 |doi=10.1016/j.geobios.2019.10.006 |bibcode=2019Geobi..57..111S |s2cid=213563873 |url=http://real.mtak.hu/112913/1/Szab%C3%B3%20et%20al%202019_pre%20proof.pdf }}
• Cretaceous (probably Barremian–Aptian) fish fossils with strong affinities with Early Cretaceous faunas of Thailand are described from Pahang (Malaysia) by Teng et al. (2019).{{Cite journal|author1=Yu He Teng |author2=Masatoshi Sone |author3=Ren Hirayama |author4=Masataka Yoshida |author5=Toshifumi Komatsu |author6=Suchada Khamha |author7=Gilles Cuny |year=2019 |title=First Cretaceous fish fauna from Malaysia |journal=Journal of Vertebrate Paleontology |volume=39 |issue=1 |pages=e1573735 |doi=10.1080/02724634.2019.1573735 |bibcode=2019JVPal..39E3735T |s2cid=155143419 }}
• Description of a freshwater fish assemblage from the Cretaceous (Albian-Cenomanian) Açu Formation (Brazil) is published by Veiga, Bergqvist & Brito (2019).{{Cite journal|author1=Ingrid Martins Machado Garcia Veiga |author2=Lilian Paglarelli Bergqvist |author3=Paulo M. Brito |year=2019 |title=The fish assemblage of the Cretaceous (?Albian-Cenomanian) Açu formation, Potiguar basin, northeastern Brazil |journal=Journal of South American Earth Sciences |volume=93 |pages=162–173 |doi=10.1016/j.jsames.2019.04.015 |bibcode=2019JSAES..93..162V |s2cid=150301906 }}
• Description of Eocene (Bartonian) fish fauna from the Luna de Sus locality (Romania) is published by Trif, Codrea & Arghiuș (2019).{{cite journal |author1=Nicolae Trif |author2=Vlad Codrea |author3=Viorel Arghiuș |year=2019 |title=A fish fauna from the lowermost Bartonian of the Transylvanian Basin, Romania |journal=Palaeontologia Electronica |volume=22 |issue=3 |pages=Article number 22.3.56 |doi=10.26879/909 |s2cid=204269140 |doi-access=free }}
• A study on the composition of the otolith assemblage from the Santa Barbara Basin near the coast of California over the preceding two millennia is published by Jones & Checkley (2019).{{cite journal |author1=William A. Jones |author2=David M. Checkley Jr. |year=2019 |title=Mesopelagic fishes dominate otolith record of past two millennia in the Santa Barbara Basin |journal=Nature Communications |volume=10 |issue=1 |pages=Article number 4564 |doi=10.1038/s41467-019-12600-z |pmid=31594950 |pmc=6783546 |bibcode=2019NatCo..10.4564J }}
• A study on the evolution of the herbivorous coral reef fishes, as indicated by data from extant and fossil species, is published by Siqueira, Bellwood & Cowman (2019).{{Cite journal|author1=Alexandre C. Siqueira |author2=David R. Bellwood |author3=Peter F. Cowman |year=2019 |title=The evolution of traits and functions in herbivorous coral reef fishes through space and time |journal=Proceedings of the Royal Society B: Biological Sciences |volume=286 |issue=1897 |pages=Article ID 20182672 |doi=10.1098/rspb.2018.2672 |pmid=30963846 |pmc=6408896 }}

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