Temporal range: Callovian to late Tithonian
Colymbosaurus humerus, OUMNH
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Plesiosauria
Suborder: Plesiosauroidea
Family: Cryptoclididae[1]
Genus: Colymbosaurus
Seeley, 1874
  • C. trochanterius Owen, 1840 type
Colymbosaurus sacral vertebra

Colymbosaurus is a genus of English plesiosaur described in 1874 by Seeley. The only bones found include 74 vertebrae, ribs, coracoids, a scapula and fore and hind limbs (fins).[2] This specimen may be the missing body of Kimmerosaurus, which would make this a cryptoclid instead of an elasmosaurid. Colymbosaurus may be a senior synonym of Kimmerosaurus.[3]


  1. ^ Gasparini, Z., Bardet, N., and Iturralde-Vinent, M. (2002). "A new cryptoclidid plesiosaur from the Oxfordian (Late Jurassic) of Cuba". Geobios 35 (2): 201–211.,43,39,20091210003120-ZZ/PAL_E2408.pdf. 
  2. ^ Brown, D. S. (1981). "The English Upper Jurassic Plesiosauridea (Reptilia) and a review of the phylogeny and classification of the Plesiosauria". Bulletin of the British Museum of Natural History 35 (4): 253–347. 
  3. ^ F. Robin O'Keefe and Hallie P. Street (2009). "Osteology Of The Cryptoclidoid Plesiosaur Tatenectes laramiensis, With Comments On The Taxonomic Status Of The Cimoliasauridae". Journal of Vertebrate Paleontology 29 (1): 48–57.