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Pahasapasaurus haasi

Reptilia - Sauropterygia - Polycotylidae

Taxonomy
Pahasapasaurus haasi was named by Schumacher (2007). Its type specimen is AMM 98.1.1, a partial skeleton (partial skull, portions of left front and rear paddles, poorly preserved vertebral column and rib portions), and it is a 3D body fossil. Its type locality is Maloney Creek (Pahasapasaurus type locality), which is in a Cenomanian marine sandstone in the Greenhorn Limestone Formation of South Dakota. It is the type species of Pahasapasaurus.

Synonymy list
YearName and author
2007Pahasapasaurus haasi Schumacher pp. 134-143 figs. 2-7

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
RankNameAuthor
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
orderSauropterygia
Pistosauria(Baur 1890)
Plesiosauria(de Blainville 1835)
superfamilyPlesiosauroideaWelles 1943
Cryptoclidia
Xenopsaria
Leptocleidia
familyPolycotylidaeWilliston 1908
genusPahasapasaurus
specieshaasi

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. A. Schumacher 2007A relatively large (6 m in length), “long-beaked” plesiosaur possessing derived cranial features characteristic of polycotylids, a palate configuration unique among polycotylids, and plesiomorphic paddle morphologies. Diagnostic characters include anterior interpterygoid vacuity absent; pterygoids united along midline anterior to parasphenoid; parasphenoid relatively robust element, possessing prominent ventral keel and sutured to dorsal surface of pterygoids; pineal foramen absent; temporal fenestra elongate (as in Trinacromerum); symphysis elongate and including the splenial, encompassing the first 12 dentary teeth; teeth faintly striate on medial face; homodont dentition; teeth relatively robust; humerus sigmoidally curved; propodials bearing three distal facets and only a minor degree of posterodistal expansion; epipodials longer than wide, bearing distinct antebrachial foramen; phalanges rounded and elongate