Thalassiodracon is an extinct genus of plesiosauroid from the Pliosauridae that was alive during the Late Triassic-Early Jurassic and is known exclusively from the Lower Lias of England. The type and

Anningasaura is an extinct genus of basal plesiosaur. It is known from a single type species, A. lymense, discovered in Early Jurassic rocks of Lyme Regis in the United Kingdom.