Species: trochanterius (OWEN, 1840) SEELEY, 1874
Referred material:
= Plesiosaurus megadeirus SEELEY, 1869
Etymology:
= Colymbosaurus megadeirus (SEELEY, 1869) SEELEY, 1874Referred 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).