Genus: Rhomaleosaurus SEELEY, 1874

Species: zetlandicus (PHILLIPS, in ANON, 1854)
Etymology:

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.
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Species: victor FRAAS, 1910
Etymology:

Holotype:

Locality: Holzmaden, Baden-Wurttemberg State, Germany.

Horizon: Upper Liassic.

Biostratigraphy:

Age: Lias Epoch, Late Early Jurassic.

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