|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Reptilia - Sauropterygia - Rhomaleosauridae
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.
|Swinton 1930||Sauropterygian with a long skull and a long neck tapering from back to front. Cervical vertebrae moderately long, centra broader than high and narrow across the neurapophyses. Articular faces only slightly concave, and the anterior and posterior margins of the centrum rugose. Dorsals smooth and with constricted centra; articular faces not deeply concave; neural spines moderately high; transverse processes wholly supported by the arch. Sacral vertebrae with large rib-facets on the centra, and large and stout ribs. Caudals with rugose anterior and posterior margins to centra, articular faces more deeply cupped than the other vertebrae.|
|H. F. Ketchum and A. S. Smith 2010||A plesiosaurian with the following autapomorphies: posterior convergence of the long axes of the posterior interpterygoid vacuities; triangular emargination in the posterior border of the coracoid; triangular emargination in the posterior border of the ischium.|