Classification of Lydekker 1889

G. †Neusticosaurus Seeley 1882
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Fm. †Mesosauridae Baur 1889
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G. †Mesosaurus Gervais 1865
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†Mesosaurus tenuidens Gervais 1865
†Mesosaurus tumidus Cope 1885
Invalid names: Stereosternum Cope 1885 [synonym]
Subor. †Sauropterygia Owen 1859
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Fm. †Lariosauridae Gervais 1859
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G. †Lariosaurus Curioni 1847
G. †Psilotrachelosaurus Nopsca 1928
Fm. †Nothosauridae Baur 1889
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G. †Conchiosaurus Meyer 1833
G. †Nothosaurus Münster 1834
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†Nothosaurus mirabilis Münster 1834
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Invalid names: Dracosaurus bronni Auct 1834 [synonym], Plesiosaurus speciosus Munster 1834 [synonym]
Invalid names: Dracosaurus Munster 1834 [synonym]
G. †Pistosaurus Meyer 1839
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†Pistosaurus longaevus Meyer 1839
Fm. †Plesiosauridae Gray 1825
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G. †Cimoliosaurus Leidy 1851
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Invalid names: Plesiosaurus crassicostatus Owen 1870 [synonym]
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Invalid names: Plesiosaurus balticus Schröder 1885 [synonym], Plesiosaurus ichthyospondylus Seeley 1869 [synonym]
†Cimoliosaurus brevior Lydekker 1889
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Invalid names: Plesiosaurus gardneri Seeley 1878 [synonym], Pliosaurus gigas Schröder 1885 [synonym]
†Cimoliosaurus eurymerus Phillips 1871
†Cimoliosaurus haasti Hector 1874
†Cimoliosaurus hoodii Owen 1870
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Invalid names: Plesiosaurus degenhardti Koken 1887 [synonym]
†Cimoliosaurus neocomiensis Campiche 1860
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Invalid names: Plesiosaurus gurgitis Renevier 1858 [synonym]
†Cimoliosaurus oxoniensis Phillips 1871
†Cimoliosaurus planus Owen 1864
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Invalid names: Cimoliosaurus biangulatus Cope 1869 [synonym], Cimoliosaurus triangulatus Cope 1869 [synonym], Plesiosaurus phillipsi Sauvage 1871 [synonym], Plesiosaurus winspitensis Seeley 1871 [synonym]
†Cimoliosaurus richardsoni Lydekker 1889
†Cimoliosaurus smithi Owen 1884
†Cimoliosaurus tenuis Hector 1874
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Invalid names: Plesiosaurus affinis Owen 1840 [synonym], Plesiosaurus manseli Hulke 1870 [synonym], Plesiosaurus megadirus Seeley 1869 [synonym], Plesiosaurus validus Phillips 1871 [synonym], Pliosaurus trochanterius Owen 1840 [synonym]
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Invalid names: Plesiosaurus doedicomus Owen 1840 [synonym], Plesiosaurus subdepressus Owen 1854 [synonym]
†Cimoliosaurus valdensis Lydekker 1889
†Cimoliosaurus valdensis Lydekker 1889
Invalid names: Brimosaurus Leidy 1854 [synonym], Colymbosaurus Seeley 1874 [synonym], Discosaurus Leidy 1851 [synonym], Elasmosaurus Cope 1868 [synonym], Mauisaurus Hector 1874 [synonym], Muraenosaurus Seeley 1874 [synonym], Oligosimus Leidy 1872 [synonym], Piptomerus Cope 1887 [synonym], Polycotylus Cope 1869 [synonym], Trinacromerum Cragin 1888 [synonym]
G. †Eretmosaurus Seeley 1874
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†Eretmosaurus rugosus Owen 1840
G. †Peloneustes Lydekker 1889
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†Peloneustes aequalis Phillips 1871
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Invalid names: Pliosaurus sterrodirus Seeley 1869 [synonym]
†Peloneustes philarchus Seeley 1869
G. †Plesiosaurus de la Beche and Conybeare 1821
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†Plesiosaurus bitractensis Sauvage 1883
†Plesiosaurus conybeari Sollas 1881
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Invalid names: Plesiosaurus laticeps Owen 1867 [synonym]
†Plesiosaurus costatus Owen 1840
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Invalid names: Plesiosaurus etheridgei Huxley 1858 [synonym], Plesiosaurus triatarsostinus Hawkins 1834 [synonym]
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Invalid names: Plesiosaurus brachycephalus Owen 1840 [synonym]
G. †Pliosaurus Owen 1841
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Invalid names: Plesiosaurus giganteus Conybeare 1824 [synonym]
†Pliosaurus evansi Seeley 1869
†Pliosaurus ferox Sauvage 1873
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Invalid names: Pliosaurus pachydirus Seeley 1869 [synonym], Thaumatosaurus mosquensis Kiprijanoff 1883 [synonym]
†Pliosaurus grossouvrei Sauvage 1873
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Invalid names: Pliosaurus wosinskii Fischer de Waldheim 1846 [synonym], Spondylosaurus frearsi Fischer de Waldheim 1845 [synonym]
†Pliosaurus macromerus Phillips 1871
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Invalid names: Ischyrodon meriani Meyer 1838 [synonym], Pliosaurus grandis Owen 1840 [synonym]
Invalid names: Ischyrodon Merian 1838 [synonym], Liopleurodon Sauvage 1873 [synonym], Spondylosaurus Fischer 1845 [synonym]
G. †Polyptychodon Owen 1841
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Invalid names: Lutkesaurus Kiprijanoff 1883 [synonym]
G. †Thaumatosaurus Meyer 1841
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†Thaumatosaurus carinatus Cuvier 1824
†Thaumatosaurus cramptoni Carte and Baily 1863
†Thaumatosaurus indicus Lydekker 1877
†Thaumatosaurus megacephalus Stutchbury 1846
†Thaumatosaurus propinquus Tate and Blake 1876
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Invalid names: Plesiosaurus simpsoni Blake 1876 [synonym]
Invalid names: Rhomaleosaurus Seeley 1874 [synonym]
Or. †Ichthyopterygia Owen 1840
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Fm. †Ichthyosauridae Bonaparte 1841
G. †Ichthyosaurus Koenig 1818
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Invalid names: Ichthyosaurus microdon Wagner 1851 [synonym]
†Ichthyosaurus campylodon Carter 1846
†Ichthyosaurus communis Conybeare 1821
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Invalid names: Ichthyosaurus chiropolyostinus Hawkins 1834 [synonym]
†Ichthyosaurus conybeari Lydekker 1888
†Ichthyosaurus indicus Lydekker 1879
†Ichthyosaurus integer Bronn 1844
†Ichthyosaurus intermedius Conybeare 1822
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Invalid names: Ichthyosaurus chiroparamecostinus Hawkins 1834 [synonym]
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Invalid names: Ichthyosaurus longirostris Mantell 1851 [synonym]
†Ichthyosaurus ovalis Phillips 1871
†Ichthyosaurus tenuirostris Conybeare 1822
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Invalid names: Ichthyosaurus chirostrongulostinus Hawkins 1834 [synonym], Ichthyosaurus grandipes Sharpe 1830 [synonym], Ichthyosaurus sinuatus Theodori 1854 [synonym]
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Invalid names: Ichthyosaurus cuvieri Valenciennes 1861 [synonym], Ichthyosaurus normanniae Valenciennes 1861 [synonym], Ichthyosaurus posthumus Wagner 1851 [synonym]
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Invalid names: Ichthyosaurus longifrons Owen 1881 [synonym]
Invalid names: Gryphus Wagler 1830 [synonym]
†Conchiosaurus clavatus Meyer 1833
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Invalid names: Nothosaurus venustus Munster 1834 [synonym]
†Plesiosaurus dolichodeirus Conybeare 1824
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Invalid names: Plesiosaurus cliduchus Seeley 1865 [synonym]
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Invalid names: Ichthyosaurus brachyspondylus Owen 1881 [synonym]
†Ichthyosaurus platyodon Conybeare 1822
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Invalid names: Ichthyosaurus giganteus Leach 1840 [synonym]
†Ichthyosaurus trigonodon Theodori 1843
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Invalid names: Ichthyosaurus crassimanus Tate and Blake 1876 [synonym]
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Invalid names: Liopleurodon bucklandi Sauvage 1873 [synonym]
†Cimoliosaurus magnus Leidy 1851
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Invalid names: Discosaurus vetustus Leidy 1851 [synonym]
†Cimoliosaurus plicatus Phillips 1871
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Invalid names: Muraenosaurus leedsi Seeley 1874 [synonym], Plesiosaurus hexagonalis Phillips 1871 [synonym], Plesiosaurus infraplanus Phillips 1871 [synonym]
†Nothosaurus giganteus Münster 1834
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Invalid names: Nothosaurus aduncidens Meyer 1855 [synonym]
†Ichthyosaurus hectori Lydekker 1889
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Invalid names: Ichthyosaurus australis Hector 1878 [replaced]