Assertion: necked plesiosaur | /r/CapableOf | become extinct
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text: On this this webpage, we will consider the pliosaurids to include the large-headed, short-necked plesiosaurs, such as Kronosaurus and Brachauchenius lucasi that became extinct about the Middle Turonian stage of the Late Cretaceous, along with the polycotylid Trinacromerum bentonianum.