Zangerl, Rainer Formerly, Department of Geology, Field Museum of Natural History, Chicago, Illinois.
Olson, Everett C. Department of Biology, University of California, Los Angeles, California.
Last reviewed:January 2020
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An infraclass of Mesozoic reptiles that are, without exception, adapted to the marine environment. The infraclass includes the nothosaurs, plesiosaurs, and placodonts. These reptiles, along with the ichthyosaurs, played a significant role as predators within the marine animal community of the Mesozoic Era.
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