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Augustasaurus hagdorni

Reptilia

Taxonomy
Augustasaurus hagdorni was named by Sander et al. (1997). Its type specimen is FMNH PR 1974 and is not a trace fossil. Its type locality is Muller Canyon, which is in an Illyrian marginal marine mudstone in the Favret Formation of Nevada.

Synonymy list
YearName and author
1997Augustasaurus hagdorni Sander and et al.
2001Augustasaurus hagdorni O'Keefe p. 9
2002Augustasaurus hagdorni Rieppel et al. pp. 578-588 figs. 1-7

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
RankNameAuthor
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
suborderSauropterygia
—Pistosauria(Baur 1890)
genusAugustasaurusSander et al. 1997
specieshagdorniSander et al. 1997

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.

†Augustasaurus hagdorni Sander 1997
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Diagnosis
ReferenceDiagnosis
O. Rieppel et al. 2002Pistosaur with maxillary tooth row extending backwards beyond posterior margin of orbit to level below anterior corner of upper temporal fossa; frontals paired; frontal entering anteromedial margin of upper temporal fossa without forming descending flange; para-basisphenoid with ventrally projecting sagittal crest; posterior palatine vacuities present (convergent in Plesiosaurus); epipterygoid broad dorsally; dorsal neural spines terminating in distinct “saw-cut” rugosities, middle dorsal vertebrae with double facets of unfinished bone near posterior end of neural spine; posteriorly slanted transverse processes with round rib articular facets.