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In 1923, Charles Lewis Camp included the groups Varanoidea and Mosasauroidea, or monitor lizards and mosasaurs (a group of large marine reptiles from the Cretaceous).
In turn, belemnites appear to have formed part of the diet of marine reptiles such as Ichthyosaurs, whose fossilized stomachs frequently contain phosphatic hooks from the arms of cephalopods.
The oceans remained much the same as the Late Cretaceous seas, only that there was less life, few remaining marine reptiles (all of which were turtles and crocodiles), and other lesser known animals.
Sinosaurosphargis is an extinct genus of non-sauropterygian marine reptile known from the lower Middle Triassic (Pelsonian substage, Anisian stage) of Yangmazhai, Luoping County of Yunnan Province, southwestern China.