Plesiosauria
  蛇頸龍亞目
  Ple·si·o·sau·ri·a n. pl.  Paleon. An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also {Sauropterygia}.
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  Plesiosauria
       n : any of the plesiosaurs [syn: suborder Plesiosauria]