Plesiopterys is an extinct genus of plesiosaur originating from the Posidonienschiefer of Holzmaden, Germany, and lived during the Early Jurassic period. The type and only species is P. wildi, known f

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