|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Reptilia - Sauropterygia - Polycotylidae
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.
|B. A. Schumacher 2007||A 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|