After Rieppel, 1997, 1998ab, Rieppel & Hagdorn, 1997, Rieppel, Sander & Storrs, 2002, and Cheng, Chen, Zeng & Cai, 2012
Family -level taxonomy of all sauropterygians.
<==o †Sauropterygia Owen, 1860
|?- †Thalattosauriformes Merriam, 1905 sensu Rieppel, 1997
`--+?- †Atopodentatus unicus Cheng, Chen, Shang & Wu, 2014 [very tentative placement]
|?-o †Placodontiformes Neenan, Klein & Scheyer, 2013
| |-- †Palatodonta bleekeri Neenan, Klein & Scheyer, 2013
| `-- †Placodontia Cope, 1871 sensu Rieppel, 2000
`--o †Eosauropterygia Rieppel, 1994
`--o †Eusauropterygia Tschanz, 1989 sensu Rieppel, 1997, and Rieppel & Hagdorn, 1997
|?- †Sanchiaosaurus dengi Young, 1965
|--o †Nothosauroidea Baur, 1889
| |-- †Largocephalosaurus polycarpon Cheng, Chen, Zeng & Cai, 2012
| `--+?- †Wumengosaurus delictomandibularis Jiang, Rieppel, Motani, Hao, W-C. Sun, Schmitz, & Z-Y. Sun, 2008
| `--+--o †Pachypleurosauroidea Huene, 1956
| | `-- Pachypleurosauridae Nopcsa, 1928
| `--+--o †Keichousaurus Young, 1958 sensu Cheng et al., 2012
| | |?- †K. sp. [CM 91.92.1 (Rieppel, 1994a)]
| | |-- †K. hui Young, 1958
| | |-- †K. lusiensis Gonzui, 1978
| | `-- †K. yuananensis Young, 1965
| `--o †Nothosauria
| |?- †Hemilopas mentzeli Meyer, 1851
| |--o †Simosaurus Meyer, 1842 [Simosauridae]
| | |?- S.? mougeoti Meyer, 1842
| | |?- S. guilelmi Meyer, 1855
| | `-- S. gaillardoti Meyer, 1842
| `-- †Nothosauridae Baur, 1889
`--o †Pistosauroidea Baur, 1887-1890 [non Zittel, 1887]
|--+-- †Corosaurus alcovensis Case, 1936
| |-- †Chinchenia sungi Young, 1965
| `-- †Kwangsisaurus orientalis Young, 1959a
`--o †Pistosauria Baur, 1887-1890 sensu Rieppel, 1998 [non Zittel, 1887]
|--o †Cymatosaurus Fritsch, 1894 [Cymatosauridae]
| |?- †C. stensioeii (Haas, 1963) [Micronothosaurus stensioeii Haas, 1963]
| |?- †C. erythreus
| |?- †C. friedericianus
| |?- †C. latifrons (Gurich, 1884)
| |?- †C. nova (Rieppel, 1987) Rieppel, 1997
| `-- †C. multidentatus von Huene, 1958
|?- †Bobosaurus forojuliensis Dalla Vecchia, 2006
|?- †Yunguisaurus liae Cheng et al., 2006
`--+-- †Plesiosauria de Blainville, 1835 (plesiosaurs; joutsenliskot)
`--o †Pistosauridae Baur, 1887-1890 [non Zittel, 1887]
|-- †Augustasaurus hagdorni Sander, Rieppel & Bucher, 1997
`--o †Pistosaurus Meyer, 1839
|?- †P. grandaevus Meyer, 1855
`-- †P. longaevus Meyer, 1839
Sauropterygia incertae sedis:
Deirosaurus italicus Owen, 1854
Lamprosauroides goepperti Schmidt, 1928
Nothosauravus geraensis Kuhn, 1958
†Saurosphargidae
†Saurosphargis voltzi v. Huene, 1936 [type destroyed in WWII]
†Sinosaurosphargis yunguiensis Li, Rieppel, Wu, Zhao & Wang, 2011
After Neenan, Klein & Scheyer, 2013
<==+-- †Ichthyopterygia
`--o †Sauropterygia
|-- †Thalattosauriformes
`--+--+-- †Hanosaurus
| `-- †Eusaurosphargis
`--+-- †Helveticosaurus
`--+-- †Sinosaurosphargis
`--+--o †Placodontiformes
| |-- †Palatodonta bleekeri
| `-- †Placodontia
`--+--+-- †Yunguisaurus
| `--+-- †Plesiosauria
| `--+-- †Pistosaurus
| `-- †Augustasaurus
`--+--+-- †Corosaurus
| `-- †Cymatosaurus
`--+-- †Pachypleurosauroidea
`--+-- †Simosaurus
`-- †Nothosauridae
|
After Li, Rieppel, Wu, Zhao & Wang, 2011
<==+-- Lepidosauromorpha
`--+-- Testudines
`--+--+-- †Helveticosaurus
| `-- †Eusaurosphargis
`--+--+-- †Thalattosauriformes
| `--o †Saurosphargidae
| |-- †Saurosphargis
| `-- †Sinosaurosphargis
`--o †Sauropterygia
|-- †Placodontia
`-- †Eosauropterygia
|
After Rieppel, 1997, and Rieppel & Hagdorn, 1997
<==o †Eosauropterygia
|-- †Pachypleurosauroidea
`--o †Eusauropterygia
|--o †Simosauridae
| |?- †Shingyisaurus
| `-- †Simosaurus
`--o Nothosauroidea
|?- †Sanchiaosaurus
|-- †Nothosauridae
`--o †Pistosauroidea
|--+?- †Corosaurus
| |-- †Chinchenia
| `-- †Kwangsisaurus
`--o †Pistosauria
|-- †Augustasaurus
|-- †Cymatosaurus
`--+-- †Pistosaurus
`-- †Plesiosauria
|
|
Reference(s):
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–W. H. Freeman and company, New York, 1988, 698.
- Carroll, R. L., 1988: Appendix. 594-648.
in Carroll, R. L. 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698
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–Nature: Vol. 432, #7015, pp. 383-386 [doi: 10.1038/nature03050]
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–iNet: The Plesiosaur Site: http://www.plesiosaur.com/taxonomy/Cymatosauridae.htm
- Forrest, R., 2002: Nothosauridae - species
–iNet: The Plesiosaur Site: http://www.plesiosaur.com/taxonomy/nothosauridae.htm
- Forrest, R., 2002: Pistosauridae - species
–iNet: The Plesiosaur Site: http://www.plesiosaur.com/taxonomy/pistosauridae.htm
- Forrest, R., 2002: Simosauridae - species
–iNet: The Plesiosaur Site: http://www.plesiosaur.com/taxonomy/Simosauridae.htm
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in Callaway, J. M. & Nicholls, E. L., (eds.) 1997: Ancient Marine Reptiles. xivi-501
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