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Simoedosaurus dakotensis

Reptilia -

Taxonomy
Simoedosaurus dakotensis was named by Erickson (1987). Its type specimen is SMM P76.10.1, a skeleton (a partly disarticulated skeleton), and it is a 3D body fossil. Its type locality is 2 miles north of Judson, which is in a Tiffanian terrestrial horizon in the Slope Formation of North Dakota.

Synonymy list
YearName and author
1987Simoedosaurus dakotensis Erickson pp. 237-249 figs. 2-18

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
RankNameAuthor
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Choristodera()
suborderNeochoristoderaEvans and Hecht 1993
genusSimoedosaurusGervais 1877
speciesdakotensis

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
B. R. Erickson 1987Differs from Simeodosaurus lemoinei in having shorter snout, with broader base, muzzle only 1/3 total length of the skull, elongated lachrymal, skull roofing bones more extensive, postorbital-parietal contact extending far forward of supratemporal fenestra, and less tooth size differentiation. Vertebrae have distinctive features such as: greater length of centrum and neural arch of axis; and less development of ventral carina on all cervicals. The femur is proportionately lighter and longer