plesiosauroid

fossil reptile group

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In plesiosaur
…the head elongated; and the plesiosauroids (which belong to the suborder Plesiosauroidea), in which the head remained relatively small and the neck assumed snakelike proportions and became very flexible. The late evolution of plesiosaurs was marked by a great increase in size. For example, Elasmosaurus, a plesiosaurid, had as many…
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