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Stratesaurus is a very small-bodied basal plesiosaur known from the lowermost Jurassic (Blue Lias Formation) of Street, Somerset .

Stratesaurus is represented by three specimens. The holotype specimen (OUMNH J.10337) was named and briefly described by Benson, Evans and Druckenmiller (2012), and later described in detail along with two referred specimens by Benson, Evans and Taylor (2015).

Kaiwhekea, also known as the ‘Shag Point Plesiosaur’, was classified as a cryptoclidid by Cruickshank and Fordyce (2002). More recent classifications regard it as an aristonectid. It has an unusually large number of small needle-like teeth and a shortened snout, much like the closely related Aristonectes.