|Named By:||Harry Govier Seeley in 1874|
|Time Period:||Callovian to late Tithonian|
|Location:||England, Dorset - Jurassic Coast, Kimmeridge Clay|
|Size:||Uncertain due to incomplete fossil materia|
|Fossil(s):||Only partial post cranial remains including vertebrae, ribs, limbs, and parts of the shoulder girdle|
|Classification:||| Chordata | Reptilia | Sauropterygia | Plesiosauria | Plesiosauroidea ||
Colymbosaurus is a genus of cryptoclidid plesiosaur from the Late Jurassic (Kimmeridgian-Tithonian) of the UK and Svalbard, Norway. There are two currently recognized species, C. megadeirus and C. svalbardensis.