After Rieppel & †Zanon, 1997, Rieppel, 2000, and Naish, 2000-2004
Family -level taxonomy of all sauropterygians.<==o †Placodontia Cope, 1871 sensu Rieppel, 2000 |?- †Chelyoposuchus crassisquamatus [jr. synon. of Helodus?] |?- †Helveticosaurus zollingeri [?Helveticosauridae] [an aquatic non-sauropterygian archosauromorph (Rieppel 1989)??] `--o †Placodontoidea Cope, 1871 (sensu Peyer & Kuhn-Schnyder 1955, and Rieppel & †Zanon, 1997) [paraphyletic sensu Rieppel, 2000] |-- †Paraplacodus broilii Peyer, 1931a [Paraplacodontidae Peyer & Kuhn-Schnyder, 1955] `--+--o †Placodus Agazzis, 1833 [Anomosaurus, Crurosaurus] L.-M. Trias. Eu. M. Trias. SWAs. [Placodontidae Cope, 1871] | |-- †P. gigas Agazzis, 1833 [P. aethiopi; P. aethiops; P. andriani; P. angustus; P. antiquior; P. bathygnathus; P. bombidens; P. pachygnathus; P. quinimolaris; P. rugosus; P. strunzi] | `-- †P. nostratus `--o †Cyamodontoidea Nopsca 1923 (sensu Peyer & Kuhn-Schnyder 1955 |?- †Psephosaurus mosis Brotzen, 1957 |?- †“Psephosaurus” picardi Bronzen, 1957 |?- †“Psephosaurus” sinaiticus Haas, 1959 |?- †“Psephosaurus” rhombifer Haas, 1969 |?- †“Psephosaurus” ramonensis (nomen nudum) |?- †“Psephosaurus” suevicus |--+-- †Henodus chelyops v. Huene, 1936 [Henodontidae] | `--o †Cyamodus Meyer 1863 [Cyamodontidae] | |-- †C. rostratus (Münster, 1839) | |-- †C. munsteri (Agassiz, 1833-45) [C. münsteri; C. laticeps?] [jr. synon. of C. rostratus?] | |?- †C. tarnowitzensis Gürich, 1884 [type lost in WWII] | |-- †C. hildegradis Peyer, 1931a | `-- †C. kuhnschnyderi Nosotti & Pinna 1993 [C. kuhn-schnyderi (Nosotti & Pinna 1993a] `--+?- †Macroplacus raeticus Schubert-Klempnauer, 1975 [possibly synon. to Psephoderma alpinum] `--+-- †Protenodontosaurus italicus Pinna, 1990 `--o †Placochelyidae |?- †Psephochelys polyosteoderma Li & Rieppel, 2002; |-- †Placochelys placodonta Jaekel, 1902 [Placochelyanus] `--o †Psephoderma Meyer, 1858 |-- †P. alpinum Meyer, 1858 [Placochelyanus stoppanii Kuhn, 1969; Placochelys malanchinii; Placochelys stoppanii; Placodus zitteli; ?Macroplacus raeticus Schubert-Klempnauer, 1975; ?Placochelys alpis sordidae] `-- †P. anglicum Meyer, 1867
Reference(s):
- Carroll, R. L., 1988: Vertebrate paleontology and evolution.
–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 - Li, C. & Rieppel, O., 2002: A new cyamodontoid placodont from Triassic of Guizhou, China.
–Chinese Science Bulletin: Vol. 47, #5, pp. 403-407 [doi: 10.1360/02tb9094] - Naish, W., 2000: Placodonts: The bizarre ‘walrus-turtles’ of the Triassic. (Updated: 2004-03-26)
–iNet: The Oceans of Kansas: http://www.oceansofkansas.com/placodnt.html; [visited: 2005-05-26] - Rieppel, O. C., 1997: Part II: Sauropterygia - Introduction. 107-119
in Callaway, J. M. & Nicholls, E. L., (eds.) 1997: Ancient Marine Reptiles.
–Academic Press, San Diego, 1997, pp. xivi-501 - Rieppel, O. C., 2000: Paraplacodus and the phylogeny of the Placodontia (Reptilia: Sauropterygia).
–Zoological Journal of the Linnean Society: Vol. 130, #4, pp. 635-659 - Rieppel, O. C. & Hagdorn, H., 1997: Paleobiogeography of Middle Triassic Sauropterygia in Central and Western Europe. 121-144
in Callaway, J. M. & Nicholls, E. L., (eds.) 1997: Ancient Marine Reptiles.
–Academic Press, San Diego, 1997, xivi-501 - Rieppel, O. C. & †Zanon, R. T., 1997: The interrelationships of Placodontia.
–Historical Biology: Vol. 12, pp. 211-227 - Sues, H.-D., 1987: On the skull of Placodus gigas and the relationships of the Placodontia.
–Journal of Vertebrate Paleontology: Vol. 7, #2, pp. 138-144