|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
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.
|P. J. Currie 1980||same as for genus|
|C. Bickelmann et al. 2009||Aquatic neodiapsid reptile characterized by the absence of a quadratojugal and the presence of a short posterior process of the jugal, resulting in an open lower temporal arcade; at least 36 teeth in the maxilla and 34 teeth in the lower jaw. Differs from other ‘‘Younginiformes’’ on the basis of the following combination of features: neural spines of dorsal vertebrae intermediate in height between those of Thadeosaurus and Hovasaurus; transverse processes shorter than in Kenyasaurus; cleithrum present, in contrast to Galesphyrus, Thadeosaurus, and Youngina; postaxial edge of the shaft of the humerus straighter than in Thadeosaurus and preaxial edge of the shaft not as concave; radius of twisted appearance; ulna lacking an ossified olecranon; metacarpals longer than in Hovasaurus but not as long as in Thadeosaurus; intermedium more polygonal than in Galesphyrus; pubis with long tubercle, longer than in Thadeosaurus; femur not as slender as in Kenyasaurus.|