Species: zetlandicus (PHILLIPS, in ANON, 1854) TAYLOR, 1992
Etymology:
= Plesiosaurus zetlandicus PHILLIPS, 1854
= Thaumatosaurus zetlandicus (PHILLIPS, in ANON, 1854) LYDEKKER, 1889
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: Lower Lias Epoch, Early Jurassic.
Material: Fragmentary skull and fragmentary skeleton.
Note: A single gastrolith.
Referred material:
= Plesiosaurus propinquus BLAKE, 1876 (nomen dubium)
Etymology:
= Rhomaleosaurus propinquus (BLAKE, 1876) WATSON, 1910 (nomen dubium)
Holotype: WM 851S
Locality: Kettleness, Whitby, Yorkshire County, England, Southern United Kingdom.
Horizon:
Biostratigraphy: Harpoceras falcifer zone.
Age: Upper Lias Epoch, Upper Early Jurassic.
Material: Skull and skeleton.
Referred material:
BENTON & TAYLOR, 1983
Locality: Saltwick, Whitby, Yorkshire County, England, Southern United Kingdom.
Horizon:
Biostratigraphy:
Age: Lias Epoch, Early Jurassic.
Material:
BMNH 33098-9, 33115:
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Species: cramptoni (CARTE & BAILEY, 1863) SEELEY,
1874
Etymology:
= Plesiosaurus cromptoni CARTE & BAILEY, 1863
Holotype: NMING F8785
Locality: Kettleness, near Whitby, Yorkshire County, England, Southern United Kingdom.
Horizon:
Biostratigraphy: Upper part of the Hildoceras bifrons zone.
Age: Upper Lias Epoch, Late Early Jurassic.
Material: Skull and skeleton.
Referred material:
BENTON & TAYLOR, 1983
Locality: Saltwick, Whitby, Yorkshire County, England, Southern United Kingdom.
Horizon:
Biostratigraphy:
Age: Lias Epoch, Early Jurassic.
Material:
BMNH 40123, R1008, R1365:
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Species: thorntoni ANDREWS, 1922
Etymology:
Holotype: BMNH R4853
Locality: Kingsthorpe, Northamptonshire County, England, Southern United Kingdom.
Horizon: Upper Liassic.
Biostratigraphy:
Age: Upper Lias Epoch, Late Early Jurassic.
Material: Anterior portion of the skull, and fragmentary skeleton.