Spitrasaurus is an extinct genus of cryptoclidid[1] plesiosauroid plesiosaur known from the uppermost Jurassic of central Spitsbergen, Norway[2] and likely also Kimmeridge, England.[3] It is named after a syllabic abbreviation for Spitsbergen Travel.
The holotype of S. wensaasi is PMO 219 718 and consists of sixty articulated cervical vertebrae and skull material from a juvenile,[2] and the holotype of S. larseni is SVB 1450 and also consists of cervical vertebrae.[2] A cervical vertebra, MANCH LI 5519c, was found in the Kimmeridge Clay Formation in England and was tentatively assigned to cf. Spitrasaurus in 2014 after being compared to Colymbosaurus megadeirus,[3] while more possible Spitrasaurus vertebrae found at Kimmeridge reside within the collection of Steve Etches.