Species: megadeirus (SEELEY, 1869) SEELEY, 1874
= Plesiosaurus megadeirus SEELEY, 1869
Etymology:

Holotype: SMC J29596

Locality: Ely, Cambridgshire County, England, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material: Incomplete postcranial skeleton.

Referred material:

Locality: Haddenham, Buckinghampshire County, England, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

SMC J 63919: Incomplete vertebral column (36 cervicles, four pectoral, 17 dorslas, three sarals and 28 caudal vertebrae).

Note: Rounded, anteroventrally projecting, spur-like expanseions are present on the venral surfaces of cervicals 26-28, and 31 (SASSOON, 2019).

PATON, 1975

Locality: Ely, Cambridgshire County, England, Southern United Kingdom.

Horizon:

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material:

RSM: 3 vertebrae.

ROBERTS, DRUCKENMILLER, DELSETT, & HURUM, 2017

Locality:

Horizon:

Biostratigraphy:

Age:

Material:

NHMUK R10062: Cervical, dorsal and caudal vertebrae, dorsal ribs, a coracoid, ischium and pubies, and a right humerus and some associted limb elements.

OUM J.3300: Partial right mandible, cervical, dorsl, and caudal vertebrae, patial pectoral girdle, 4 propodials, and disarticulated limb elments.

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