Belongs within: Lepidosauromorpha.
Contains: Eusauropterygia.
The Sauropterygia are a Mesozoic clade of marine reptiles including the plesiosaurs, placodonts and related taxa.
Synapomorphies (from Schoch & Sues 2015): Premaxilla large, forming most of the snout; lacrimal restricted to orbit or absent; palate akinetic; angle of transverse flange of pterygoid less than 45° from sagittal plane; cervical ribs with anterior process; three or more sacrals present; femur with deep groove on the posterior face of the distal end; coracoid foramen between coracoid and scapula; metatarsal V short with broad base; length of metatarsal I less than 50% that of metatarsal IV.
<==Sauropterygia
|--Eosauropterygia H02
| |--Eusauropterygia H02
| `--Pachypleurosauridae [Pachypleurosauria] H02
| |--Keichousaurus hui Young 1958 H02, CWJ04
| `--+--Hanosaurus H02
| `--+--+--Dactylosaurus Gurich 1884 H02, D07
| | | `--D. gracilis [incl. D. schroederi] CWJ04
| | `--Anarosaurus H02
| | |--A. heterodontus H02
| | `--A. pumilo H02
| `--+--Serpianosaurus mirigiolensis H02
| `--Neusticosaurus H02 [incl. Pachypleurosaurus Cornalia 1854 D07]
| |--N. edwardsi [=Pachypleurosaurus edwardsi] CWJ04
| |--N. peyeri H02
| `--N. pusillus H02
`--+--Sinosaurosphargis SS15
`--Placodontia [Placodontoidea] H02
|--Paraplacodus Peyer 1931 H02, D07 [Paraplacodontidae]
| `--P. broilii H02
`--+--Placodus Agassiz 1833 H02, D07
| `--P. gigas H02
`--Cyamodontoidea H02
| i. s.: Sinocyamodus xinpuensis Li 2000 H02
| Psephochelys Li & Rieppel 2002 H02
| `--P. polyosteoderma Li & Rieppel 2002 H02
| Psephosauriscus Rieppel 2002 H02
| |--P. mosis (Brotzen 1957) H02
| |--P. ramonensis Rieppel 2002 H02
| |--P. rhombifer [=Psephosaurus rhombifer] H02
| `--P. sinaiticus H02
|--Cyamodontida H02
| |--Psephosaurus suevicus H02
| |--Henodus Huene 1936 H02, D07
| | `--H. chelyops H02
| `--Cyamodus Meyer 1863 [Cyamodontidae] D07
| |--C. hildegardis H02
| |--C. kuhnschnyderi H02
| |--C. muensteri H02
| |--C. rostratus H02
| `--C. tarnowitzensis H02
`--Placochelyida H02
|--Macroplacus [Macroplacidae] H02
| `--M. raeticus H02
`--+--Protenodontosaurus [Protenodontosauridae] H02
| `--P. italicus Pinna 1990 DV06
`--+--Placochelys [Placochelyidae] H02
| `--P. placodonta H02
`--Psephoderma H02
|--P. alpinum H02
`--P. sculptata Rieppel 2002 H02
Inorganic: Placochelys placoconta minilorientalis Okamura 1987 O87
*Type species of generic name indicated
REFERENCES
[CWJ04] Cheng, Y.-N., X.-C. Wu & Q. Ji. 2004. Triassic marine reptiles gave birth to live young. Nature 432: 383–386.
[DV06] Dalla Vecchia, F. M. 2006. A new sauropterygian reptile with plesiosaurian affinity from the Late Triassic of Italy. Rivista Italiana di Paleontologia e Stratigrafia 112 (2): 207–225.
[D07] Dixon, D. 2007. The Complete Illustrated Encyclopedia of Dinosaurs & Prehistoric Creatures. Hermes House: London.
[H02] Haubold, H. 2002. Literaturbericht: Ichthyosaurier und Sauropterygier. Zbl. Geol. Paläont. Teil II 5-6: 367–403.
[O87] Okamura, C. 1987. New facts: Homo and all Vertebrata were born simultaneously in the former Paleozoic in Japan. Original Report of the Okamura Fossil Laboratory 15: 347–573.
[SS15] Schoch, R. R., & H.-D. Sues. 2015. A Middle Triassic stem-turtle and the evolution of the turtle body plan. Nature 523: 584–587.
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