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| | The Plesiosaur Directory - Classification - Plesiosauria (Site not responding. Last check: ) |
 | | Plesiosaurs are a secondarily aquatic group of carnivorous reptiles belonging to the clade Sauropterygia within the diapsid clade Euryapsida (Tayor, 1989; Caldwell, 1997). |
 | | The family Polycotylidae for example is a Late Cretaceous group of short-necked plesiosaurs, but cranial evidence (Carpenter, 1997) points to plesiosauroid affinity rather than pliosaur, despite the short necks. |
 | | Ambiguous plesiosaur material occurs in Middle Triassic deposits (Benton, 1993) but the first diagnostic plesiosaurs are uppermost Triassic in age (Taylor and Cruickshank, 1993b; Storrs, 1994, 1997). |
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