Species
Ornithopsis is currently restricted to the type species, O. hulkei and the possible second species, O. leedsi, being a nomen dubium and safely referable to Titanosauriformes incertae sedis. This revision is after Upchurch et al. (2004). As a matter of reference, other species misassigned to Ornithopsis have been identified with their respective original or new genera.
- O. hulkei Seeley 1870 (type) - nomen dubium? = Pelorosaurus hulkei (Seeley 1870) Lydekker 1889 partim
- Bothriospondylus magnus Owen 1875 = Ornithopsis hulkei Seeley 1870 olim partim = Chondrosteosaurus magnus (Owen 1875) Owen 1876 = Pelorosaurus hulkei (Seeley 1870) Lydekker 1889 partim
- O. eucamerotus Hulke 1882 - nomen dubium - may require its own genus within the Brachiosauridae
- O. leedsii Hulke 1887 - may require its own genus within the Brachiosauridae, = Cetiosaurus leedsi (Hulke 1887) Woodward 1905 = Cetiosauriscus leedsii (Hulke 1887) von Huene 1927
- O. humerocristatus (Hulke 1874) Lydekker 1888 - nomen dubium = Pelorosaurus humerocristatus Hulke 1874 vide Lydekker 1888
- O. manseli (Hulke 1874) Lydekker 1888 - nomen dubium = Ischyrosaurus manseli Hulke 1874 vide Lydekker 1888 or Pelorosaurus manseli
- O. conybearei (Mantell 1850) von Huene 1929 - nomen dubium = Pelorosaurus conybearei Mantell 1850 = "Cetiosaurus" conybeari Melville 1849
- O. suffossa (Owen 1875) von Huene 1922 = Bothriospondylus suffossus Owen 1875
- O. greppini von Huene 1922 = Cetiosauriscus greppini von Huene 1929 and Ischyrosaurus greppini
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