Genus: Rhomaleosaurus SEELEY, 1874

Species: zetlandicus (PHILLIPS, in ANON, 1854)

Holotype: YORYM G503

Locality: Alum Mine, a large coastal quarry about 2 km northeast of Loftus, and about 18 km northwest of Whitby, Yorkshire County, England, Southern United Kingdom.

Horizon: Alum Shale Member (formerly termed the 'Cement Shales' and 'Main Alum Shales'), Whitby Mudstone Formation, Lias Group.

Biostratigraphy: Hildoceras bifrons zone.

Age : Lias Epoch, Early Jurassic.

Material: Fragmentary skull and fragmentary skeleton.
Note: A single gastrolith.

Species: victor FRAAS, 1910


Locality: Holzmaden, Baden-Wurttemberg State, Germany.

Horizon: Upper Liassic.


Age: Lias Epoch, Late Early Jurassic.

Material: Skull and skeleton.
Note: A single gastrolith.