CLASS: REPTILIA LAURENTI, 1768
INFRACLASS: NEODIAPSIDA BENTON, 1985
NEODIAPSIDA: INCERTAE SEDIS
OR AMNIOTA: INCERTAE SEDIS
MAGANORDER: ICHTHYOPTERYGIA BAUR, 1887 emend nova
SUPERORDER: EOICHTHYOSAURIA MOTANI, 1999
GRANDORDER: ICHTHYOSAURIA EMEND BLAINVILLE, 1835
MICRORDER: HUENEOSAURIA MAISCH & MATZKE, 2000
Incertae sedis
ORDER: MIXOSAUROIDEA (BAUR, 1887)
Family: MIXOSAURIDAE Baur, 1887
Subfamily: MIXOSAURINAE Baur, 1887 nom. Transl. Ex MIXOSAURIDAE
Genus: Mixosaurus BAUR, 1887
M. cornalianus (BASSANI, 1886)
M. sp
MICRORDER: LONGIPINNATI HUENE, 1948
ORDER: MERRIAMOSAURIA MONTANI, 1999
SUBORDER: EUICHTHYOSAURIA MONTANI, 1999
INFRAORDER: PARVIPELVIA MONTANI, 1999
PARVORDER: NEOICHTHYOSAURIA SANDER, 2000
Superfamily: ICHTHYOSAUROIDEA McGOWAN & MONTANI, 2003
Family: STENOPTERYGIIDAE Jaekel, 1904
Genus: Stenopterygius JAEKEL, 1904
S. quadriscissus (QUENSTADT, 1858 emend FRAAS, 1891) JAEKEL, 1904
= Ichthyosaurus acustirostris WAGER, 1852
S. hauffianus HUENE, 1922
S. cuneiceps (HUENE, 1922)
S. sp
Family: ICHTHYOSAURIDAE Bonaparte, 1841
Genus: Ichthyosaurus De
la DECHENE & CONYBEARE, 1821
I. communis De la DECHENE & CONYBEARE, 1821
Family: OPHTHALMOSAURIDAE Seeley, 1874
Genus: Maiaspondylus MAXWELL & CALDWELL,
2006
M. lindoei MAXWELL & CALDWELL, 2006 (Type)
SUBCLASS: DIAPSIDA
NEODIAPSIDA: BENTON, 1985
LEPIDOSAUROMORPHA: BENTON, 1985
INFRACLASS: EURYAPSIDA COLBERT, 1945
SUPERORDER: SAUROPTERYGIA OWEN, 1860
PARVORDER: EOSAUROPTERYGIA emend RIEPPEL, 1994
ORDER: PACHYPLEUROSAURIA SANZ, 1980
Family: PACHYPLEUROSAURIDAE Nopcsa, 1928
Genus: Keichousaurus YOUNG, 1958
K. hui YOUNG, 1958
LEGION: LEPIDOSAUROMORPHA BENTON, 1983
SUBLEGION: LEPIDOSAURIA HAECKEL, 1866 (DUMERIL & BIBRON, 1839)
MAGNORDER: SQUAMATA, OPPEL, 1811
SUPERORDER: LACERTILIA OWEN, 1842
GRANDORDER: SCINCOGEKKONOMORPHA SUKHANOV, 1961
MICRORDER: SCINCOMORPHA CAMP, 1923
ORDER: ANGUIMORPHA FURBRINGER, 1900
SUBORDER: DIPLOGLOSSA COPE, 1864
INFRAORDER: THECAGLOSSA COPE, 1890
PARVORDER: MONSTERSAURIA NORELL & GAO, 1977
Superfamily: VARANOIDEA Gray, 1827 (sensu Camp, 1923)
Family: MOSASAURIDAE Gervais, 1853
Infrafamily: NATANIA
Subfamily: RUSSELLOSAURINAE
Tribe: PLIOPLATECARPINI Dollo, 1884 (sensu Russell, 1967)
Genus: Plioplatecarpus DOLLO, 1882
P. primaevus RUSSEL, 1967 (DUNKLE, in CRANDELL, 1958)
LEGION: ARCHOSAUROMORPHA HUENE, 1946
ARCHOSAURIFORMES Gauthier, 1984
SUPERCOHORT CHORISTODERA NOVA
ORDER: CHORISTODERA COPE, 1876
Family: HYPHALOSAURIDAE GAO & FOX, 2005
Genus: Hyphalosaurus GAO, TANG & WANG, 1999
H. baitaigouensis JI, JI, CHENG, YOU, LÜ & YUAN, 2004