Ornithopsis#Additional species

File:Ornithopsis.jpg

Gideon Algernon Mantell described many fossils that had been previously collected from the Tilgate Forest of the Early Cretaceous Wealden Formation in his 1833 paper on the geology of southeast England, including a bone he considered to be the {{dinogloss|quadrate}} of Iguanodon, otherwise only known definitively from teeth that had been found in the area since 1822.{{cite book|last=Mantell|first=G.A.|year=1833|chapter=Description of the Organic Remains of the Wealden, and particularly of those of the Strata of Tilgate Forest|title=The Geology of the South East of England|publisher=Cambridge University Press|pages=232–288}}{{cite book|last=Mantell|first=G.A.|year=1833|chapter=Observations on the Fossil Remains of the Hylaeosaurus, and other Saurian Reptiles, discovered in the Strata of Tilgate Forest, in Sussex|title=The Geology of the South East of England|publisher=Cambridge University Press|pages=232–288}} The bone was redescribed by Richard Owen in 1854, who reaffirmed its referral as a quadrate of Iguanodon, but also suggested it could be the same bone of Streptospondylus or Cetiosaurus as it was not directly associated with the characteristic teeth of Iguanodon.{{cite journal|last=Owen|first=R.|year=1854|title=Monograph on the Fossil Reptilia of the Wealden Formations. Part II. Dinosauria|journal=Monographs of the Palaeontographical Society|pages=1–54}} This specimen is stored as British Museum of Natural History R2239, having been purchased from Mantell in 1838.

Specimen NHMUK PV R 28632, a similar bone to NHMUK PV R 2239 was described in 1870 by Harry Govier Seeley, found in the deposits on the Isle of Wight and purchased from Mantell by the British Museum in 1853.{{cite journal|last=Seeley|first=H.G.|year=1870|title=Ornithopsis, a gigantic animal of the Pterodacyle kind from the Wealden|journal=Annals and Magazine of Natural History|volume=5|issue=4|pages=305–318}} Seeley properly identified the two fossils as {{dinogloss|vertebrae}}, and noted that the features considered by Mantell and Owen to indicate the tympanic cavity was in fact openings in the walls of the vertebral {{dinogloss|centrum}}, showing that the bones were invaded by cavities for air sacs as seen in both pterosaurs and modern birds. Seeley gave the name Ornithopsis hulkei for the vertebrae, named in honour of his colleague John Whitaker Hulke, considering the taxon to be between pterosaurs and birds, and possibly allied with dinosaurs. The genus name is derived from Greek {{lang|grc|ὄρνις}}, "bird" and {{lang|grc|ὄψις}}, "likeness".{{cite journal|last=Hulke|first=J.W.|year=1879|title=Note (3rd) on (Eucamerotus, Hulke) Ornithopsis, H. G. Seeley, = Bothrospondylus magnus, Owen, = Chondrosteous magnus, Owen|journal=Quarterly Journal of the Geological Society|volume=35|issue=1–4|pages= 752–762|doi=10.1144/GSL.JGS.1879.035.01-04.55|s2cid=131190958}}

Owen revisited the material in 1875, where he described multiple new species within his new genus Bothriospondylus. Agreeing with the vertebral identity of NHMUK PV R 2239, but considering it closer to the type species Bothriospondylus suffossus than any flying animal as Seeley had suggested, Owen gave the new species name Bothriospondylus elongatus for the specimen. For NHMUK PV R 28632, Owen named the new species Bothriospondylus magnus, as he did not consider the two Wealden vertebrae to belong to the same taxon. Owen heavily disagreed with the interpretations of Seeley that the vertebrae were open and lightly constructed and showed relationships to birds and pterosaurs, considering the name Ornithopsis to be glaringly false and thus suggesting his new names should have priority over Seeley's older designations.{{cite journal|last=Owen|first=R.|year=1875|title=Monographs on the British Fossil Reptilia of the Mesozoic Formations. Part II. (Genera Bothriospondylus, Cetiosaurus, Omosaurus)|journal=Monographs of the Palaeontographical Society|pages=15–93|url=https://www.biodiversitylibrary.org/item/182983#page/19/mode/1up}} Owen then reassigned B. magnus to the genus Chondrosteosaurus as Chondrosteosaurus magnus in 1876, considering it closely related to the type species Chondrosteosaurus gigas from the Wealden.{{cite journal|last=Owen|first=R.|year=1876|title=Monograph on the Fossil Reptilia of the Wealden and Purbeck Formations. Supplement No. VII. Crocodilia (Poikilopleuron) and Dinosauria? (Chondrosteosaurus) [Wealden]|journal=Monographs of the Palaeontographical Society|pages=1–7}}

Hulke described additional sauropod material from the Wealden in 1879, and reevaluated the designations used by Owen and Seeley. Hulke identified NHMUK PV R 28632 as the type of O. hulkei, rendering Bothriospondylus magnus and Chondrosteosaurus magnus as junior objective synonyms. As well, Hulke noted that the comment of Owen that the name Ornithopsis was misleading was false, as the vertebrae were lightly-constructed regardless of their relationships. Hulke also referred the genus Eucamerotus, named earlier by him in 1870, and the genus Chondrosteosaurus to Ornithopsis as junior synonyms, with other fossils found in the Wealden beds showing that they all shared the unique internal structure of Ornithopsis. Though William Blows identified in 1995 that most of the Wealden sauropod material has been designated as dubious or intermediate, the type vertebra of Ornithopsis shows unique features in its lateral compression and a ventral ridge, and represents a diagnostic titanosauriform.{{cite journal|last=Blows|first=W.T.|year=1995|title=The Early Cretaceous brachiosaurid dinosaurs Ornithopsis and Eucamerotus from the Isle of Wight, England|journal=Palaeontology|volume=38|issue=1|pages=187–197}}

In 2023, a fragmentary dorsal vertebra from the Balve in northwestern Germany, preserved in limestone dating to the Late Barremian-Early Aptian, was described. It was referred to Ornithopsis sp.? because it also possesses the lateral compression considered unique to Ornithopsis. However, the poor preservation of the specimen makes the referral tentative.{{Cite journal |last1=Hornung |first1=Jahn J. |last2=Sachs |first2=Sven |last3=Schwermann |first3=Achim H. |date=2023 |title=The first record of sauropod dinosaurs from a palaeotopographical upland environment and its implications for megaherbivorous dinosaur faunal turnover in the Early Cretaceous of northwestern Europe |url=https://www.researchgate.net/publication/377800496 |journal=Geologie und Paläontologie in Westfalen |volume=97 |pages=3–36}}

Hulke described pelvis material, NHMUK PV R 97, from the Wealden in 1882, found associated with a few vertebrae, as the new species Ornithopsis eucamerotus. He retained Eucamerotus and Chondrosteosaurus as synonyms of Ornithopsis, but suggested that O. hulkei should only contain the original vertebra NHMUK PV R 2239.{{cite journal|last=Hulke|first=J.W.|year=1882|title=Note on the Os Pubis and Ischium of Ornithopsis eucamerotus|journal=Quarterly Journal of the Geological Society|volume=38|issue=1–4|pages= 372–376|doi=10.1144/GSL.JGS.1882.038.01-04.41|bibcode=1882QJGS...38..372H |s2cid=128833132|url=https://zenodo.org/record/2092880}} The designation by Hulke of NHMUK PV R 2239 as type conflicted with his earlier assertion that NHMUK PV R 28632 was the type, so Lydekker corrected this in 1888 by formally designated NHMUK PV R 28632 as the only type with the consultation of Seeley.

File:Ornithopsis leedsii.png

Hulke described more material as Ornithopsis in 1887, for some vertebrae, ribs, a pelvis, and fragments collected in the Eyesbury Jurassic deposits of Northamptonshire by Alfred Nicholson Leeds. The vertebrae and pelvis showed many similarities with the specimens of Ornithopsis from the Wealden Group, but the much larger size of the Eyesbury specimens, their robusticity, and their older age were considered sufficient to describe as a new species, which Hulke named Ornithopsis leedsii after the discoverer Alfred Leeds. Hulke placed the genus within the sauropod family Atlantosauridae, suggesting a close relationship with Cetiosaurus oxoniensis.{{cite journal |last1=Hulke |first1= J.W. |year= 1887 |title=Note on some Dinosaurian Remains in the Collection of A. Leeds, Esq., of Eyebury, Northamptonshire |journal=Geological Magazine | volume=4 | issue = 8 |pages=695–702 | doi = 10.1017/S0016756800194014 |s2cid= 248534477 }} The specimens named as Ornithopsis leedsii are stored as specimens NHMUK PV R 1985-1988, having been collected in May of 1892, and possibly being the first sauropod collected by Leeds and his brothers. Unlike the other specimens, O. leedsii came from the lower Callovian deposits of the Kellaways Formation below the Oxford Clay where most specimens were derived from.{{cite book|last1=Noè|first1=L.F.|last2=Liston|first2=J.J.|last3=Chapman|first3=S.D.|year=2010|chapter='Old bones, dry subject': the dinosaurs and pterosaur collected by Alfred Nicholson Leeds of Peterborough, England|editor-last=Moody|editor-first=R.T.J.|editor2-last=Buffetaut|editor2-first=E.|editor3-last=Naish|editor3-first=D.W.|editor4-last=Martill|editor4-first=D.M.|title=Dinosaurs and Other Extinct Saurians: a Historical Perspective|series=Geological Society Special Publication|volume=343|publisher=The Geological Society|pages=49–77|doi=10.1144/SP343.4|s2cid=140608738}}

Hulke described a {{dinogloss|humerus}} found in 1868 by J.C. Mansel in the Kimmeridge Clay in 1869, considering it a large saurian possibly related to Cetiosaurus or Pelorosaurus.{{cite journal|last=Hulke|first=J.W.|year=1869|title=Note on a large Saurian Humerus from the Kimmeridge Clay of the Dorset Coast|journal=Quarterly Journal of the Geological Society|volume=25|issue=1–2|pages=386–389|doi=10.1144/GSL.JGS.1869.025.01-02.66|bibcode=1869QJGS...25..386H |s2cid=128902775}} He then gave it the name Ischyrosaurus in 1874, reiterating its close relationship to Cetiosaurus oxoniensis, Cetiosaurus humerocristatus, and Gigantosaurus.{{cite journal|last=Hulke|first=J.W.|year=1874|title=Note on a very Large Saurian Limb-bone adapted for Progression upon Land, from the Kimmeridge Clay of Weymouth, Dorset|journal=Quarterly Journal of the Geological Society|volume=30|issue=1–4|pages=16–17|doi=10.1144/GSL.JGS.1874.030.01-04.17|bibcode=1874QJGS...30...16H |s2cid=129254662|url=https://zenodo.org/record/1448519}} Though it was not given a species name at the time, Richard Lydekker identified it as the species Ornithopsis manseli in 1887 based on an unpublished manuscript name provided by Hulke, as well as describing additional Wealden material as O. hulkei, and suggesting Cetiosaurus humerocristatus was a synonym of O. leedsii.{{cite journal|last=Lydekker|first=R.|year=1887|title=Note on a new Wealden Iguanodont and other Dinosaurs|journal=Quarterly Journal of the Geological Society|volume=44|issue=1–4|pages=46–61|doi=10.1144/GSL.JGS.1888.044.01-04.08|bibcode=1888QJGS...44...46L |s2cid=129803661|url=https://zenodo.org/record/2350732}} Cetiosaurus oxoniensis was reassigned to Ornithopsis as O. oxoniensis in 1888 by Harry Govier Seeley, a proposal that was not endorsed at the time by Lydekker,{{cite journal|last=Seeley|first=H.G.|year=1888|title=Note on the Pelvis of Ornithopsis|journal=Quarterly Journal of the Geological Society|volume=45|issue=1–4|pages=391–397|doi=10.1144/GSL.JGS.1889.045.01-04.27|s2cid=130462725|url=https://zenodo.org/record/1597465}} who also suggested that O. leedsii and O. humerocristatus were possibly distinct based on a difference in age, but that Chondrosteosaurus and Ornithopsis eucamerotus were synonyms of O. hulkei.{{cite book|last=Lydekker|first=R.|year=1888|title=Catalogue of the Fossil Reptilia and Amphibia in the British Museum (Natural History). Part I. Containing the Orders Ornithosauria, Crocodilia, Dinosauria, Squamata, Rhynchocephalia, and Proterosauria|url=https://www.biodiversitylibrary.org/bibliography/61848|publisher=British Museum (Natural History). Department of Geology |pages=1–309}} Ornithopsis leedsii was referred to as the species Pelorosaurus leedsi by Lydekker in 1895,{{cite journal|last=Lydekker|first=R.|year=1895|title=On Bones of a Sauropodous Dinosaur from Madagascar|journal=Quarterly Journal of the Geological Society|volume=51|issue=1–4|pages=329–336|doi=10.1144/gsl.jgs.1895.051.01-04.25|bibcode=1895QJGS...51..329L |s2cid=128431891|url=https://zenodo.org/record/1448543}} and as the taxon Cetiosaurus leedsi by Arthur Smith Woodward in the 1905,{{cite journal |last=Woodward |first=A.S. |year=1905 |title=On parts of the skeleton of Cetiosaurus Leedsi, a sauropodous dinosaur from the Oxford Clay of Peterborough |journal=Proceedings of the Zoological Society of London |volume=1 |issue=January–April |pages=232–243 |url=https://archive.org/details/proceedingsofzoo19051zool}} which are incorrect spellings of the species name.

File:Cetiosauriscus composite.jpg]]

Cetiosaurus leedsii (spelled as "leedsi") had additional remains referred to it by Woodward in 1905, including the anterior caudal vertebrae NHMUK PV R 1984, the distal caudals NHMUK PV R 1967, and the posterior skeleton NHMUK PV R 3078, which preserved most of the arm, leg, pelvis, and vertebrae behind the shoulders. The species was assigned to Cetiosaurus as the vertebrae were differently textured, so Woodward considered an assignment to Cetiosaurus more proper. Friedrich von Huene did not think the referral of the species to Cetiosaurus should be supported, and referred to the taxon as "Cetiosaurus" leedsi. Huene also described the species Ornithopsis (?) greppini in the same study in 1921, for a long-tailed cetiosaurid from Jurassic deposits around Bern, Switzerland.{{cite journal|last=Huene|first=F.|year=1921|title=Ueber einen Sauropoden im obern Malm des Berner Jura|journal=Eclogae Geologicae Helvetiae|volume=17|pages=80–94}} Huene retained O. greppini in the genus in an early 1927 review of sauropods, considering the genus to contain the species Ornithopsis hulkei, O. leedsii, O. humerocristatus, O. manseli, and O. (?) greppini, with the genus representing taxon within Cetiosauridae alongside Cetiosaurus, Bothriospondylus, Pelorosaurus, Dinodocus, and possibly Rhoetosaurus and "Morosaurus" brevis.{{cite journal|last=Huene|first=F.|year=1927|title=Sichtung der Grundlagen der jetzigen Kenntnis der Sauropoden|journal=Eclogae Geologicae Helvetiae|volume=20|pages=444–470}} Later in the same year, Huene revised his classification, naming the new genus Cetiosauriscus for O. leedsii as described by Woodward, and O. (?) greppini.{{cite journal |last=von Huene |first=F. |year=1927 |title=Short review of the present knowledge of the Sauropoda |journal=Memoirs of the Queensland Museum |volume=8 |pages=121–126 |url=https://paleoarchive.com/literature/Huene1927-ShortReviewSauropoda.pdf}}

File:Ischyrosaurus manseli.png

As the holotype material of Ornithopsis/Cetiosauriscus leedsii was not considered diagnostic, the more complete specimen NHMUK PV R 3078 was referred to the new taxon Cetiosauriscus stewarti, which was then designated as the type species of Cetiosauriscus as it contained the material Huene had originally named the new genus for.{{cite book |last=Charig |first=A.J. |editor-last=Jacobs |editor-first=L.L. |year=1980 |title=Aspects of Vertebrate History: Essays in Honor of Edwin Harris Colbert |chapter=A diplodocid sauropod from the Lower Cretaceous of England|publisher=Museum of Northern Arizona Press |isbn=978-0-897-34053-3 |pages=231–244}}{{cite journal |last=Charig |first=A.J. |year=1993 |title=Case 2876. Cetiosauriscus von Huene, 1927 (Reptilia, Sauropodomorpha): designation of C. stewarti Charig, 1980 as the type species |journal=Bulletin of Zoological Nomenclature |doi=10.5962/bhl.part.1874 |doi-access=free |volume=50 |issue=4 |pages=282–283 |url=http://biostor.org/reference/2621/page/1 }}{{cite journal |author=International Commission on Zoological Nomenclature |year=1995 |title=Opinion 1801. Cetiosauriscus Huene, 1927 (Reptilia, Sauropodomorpha): Cetiosauriscus stewarti Charig, 1980 designated as type species |journal=The Bulletin of Zoological Nomenclature |volume=52 |page=113 |url=https://biodiversitylibrary.org/page/12338034}}{{Cite journal|last1=Schwarz|first1=D. |last2=Mannion|first2=P. |last3=Wings|first3=O. |last4=Meyer|first4=C. |year=2020 |title=Re-description of the sauropod dinosaur Amanzia ("Ornithopsis/Cetiosauriscus") greppini n. gen. and other vertebrate remains from the Kimmeridgian (Late Jurassic) Reuchenette Formation of Moutier, Switzerland. |journal=Swiss Journal of Geosciences|volume=113|issue=2|doi=10.1186/s00015-020-00355-5|s2cid=211265622 |doi-access=free|bibcode=2020SwJG..113....2S }} Cetiosaurus leedsi was then assigned to an intermediate member of Brachiosauridae,{{cite journal|last1=Upchurch|first1=P.|last2=Martin|first2=J.|year=2003|title=The Anatomy and Taxonomy of Cetiosaurus (Saurischia, Sauropoda) from the Middle Jurassic of England|journal=Journal of Vertebrate Paleontology|volume=23|issue=1|pages=208–231|doi=10.1671/0272-4634(2003)23[208:TAATOC]2.0.CO;2|s2cid=55360032 }} considered to be a proper species of Ornithopsis, or an improper species of Ornithopsis that is an indeterminate eusauropod.{{cite journal|last1=Mannion|first1=P.D.|last2=Upchurch|first2=P.|last3=Barnes|first3=R.N.|last4=Mateus|first4=O.|year=2013|title=Osteology of the Late Jurassic Portuguese sauropod dinosaur Lusotitan atalaiensis (Macronaria) and the evolutionary history of basal titanosauriforms|journal=Zoological Journal of the Linnean Society|volume=168|pages=98–206|doi=10.1111/zoj.12029|doi-access=free}} Ornithopsis greppini was given the new genus name Amanzia in a 2020 redescription of the original material.

As Ischyrosaurus was used earlier by Edward Drinker Cope for the non-mammalian genus Ischyrotherium in 1869, the name "Ischyrosaurus" cannot be used for I. manseli, and so the species was retained as Ornithopsis manseli by David Martill and colleagues in 2006.{{cite book|last1=Martill|first1=D.M.|last2=Earland|first2=S.|last3=Naish|first3=D.|year=2006|chapter=Dinosaurs in marine strata: evidence from the British Jurassic, including a review of the allochthonous vertebrate assemblage from the marine Kimmeridge Clay Formation (Upper Jurassic) of Great Britain|title=ColectivoArqueológico-Paleontológico Salense|publisher=Actas de las III Jornadas sobre Dinosaurios y su Entorno|pages=1–31}} The species has also been considered as Pelorosaurus manseli.von Huene, F. (1909). Skizze zu einer Systematik und Stammesgeschichte der Dinosaurier. Centralblatt für Mineralogie, Geologie und Paläontologie 1909:12-22. [German]Romer, A.S. (1956). Osteology of the Reptiles. University of Chicago Press:Chicago 1-772. {{ISBN|0-89464-985-X}}Steel, R. (1970). Part 14. Saurischia. Handbuch der Paläoherpetologie/Encyclopedia of Paleoherpetology. Part 14. Gustav Fischer Verlag:Stuttgart p. 1-87. Upchurch et al., in their review of sauropods (2004), listed it as a dubious sauropod.Upchurch, P.M., Barrett, P.M., and Dodson, P. (2004). Sauropoda. In: Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.). The Dinosauria (2nd edition). University of California Press:Berkeley 259-322. {{ISBN|0-520-24209-2}} A 2010 overview of Late Jurassic sauropods from Dorset noted that O. manseli shared features seen in both Rebbachisauridae and Titanosauriformes, but lacked features to nail down its exact phylogenetic position.Paul M. Barrett, Roger B.J. Benson and Paul Upchurch (2010). "Dinosaurs of Dorset: Part II, the sauropod dinosaurs (Saurischia, Sauropoda) with additional comments on the theropods". Proceedings of the Dorset Natural History and Archaeological Society 131: 113–126.

The Ornithopsis hulkei holotype is basically a centrum lacking the neural spine. The vertebra is heavily pneumatised, filled with large cavities, camellae. It is narrow, tall, has a ridge on the underside, is opisthocoelous and has a posteriorly placed deep subtriangular pleurocoel over two thirds of its length. These features are compatible with a placement within the Titanosauriformes.{{cite book|last1=Upchurch|first1=P.|last2=Mannion|first2=P.D.|last3=Barrett|first3=P.M.|year=2011|chapter=Sauropod dinosaurs|editor-last=Batten|editor-first=D.J.|title=English Wealden Fossils|publisher=The Palaeontological Association|pages=476–525|url=https://www.researchgate.net/publication/278025152}}

Based on comparison with Giraffatitan, the holotype specimen is estimated to be {{Convert|16-18|m|ft|abbr=on}} in length, with the possible German specimen belonging to a slightly smaller individual.

{{Reflist}}

• [http://svpow.wordpress.com/2008/05/19/sauropod-pneumaticity-the-early-years/ Discussion of Ornithopsis with image]

{{Sauropodomorpha|M.}}

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Category:Macronaria

Category:Dinosaur genera

Category:Barremian dinosaurs

Category:Taxa named by Harry Seeley

Category:Fossil taxa described in 1870

Category:Dinosaurs of the United Kingdom