#order_Sauropterygia__Sauropterygia  extinct marine reptiles: plesiosaurs; nothosaurs
  supertype:  animal_order  the order of animals
  member of:  subclass_Archosauria
  member:  suborder_Plesiosauria__Plesiosauria  any of the plesiosaurs
     member:  genus_Plesiosaurus  a reptile genus of suborder Plesiosauria
        member:  plesiosaur__plesiosaurus  extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous
  member:  suborder_Nothosauria__Nothosauria  a suborder of Sauropterygia
     member:  genus_Nothosaurus  a genus of Nothosauria
        member:  nothosaur  extinct marine reptile with longer more slender limbs than plesiosaurs and less completely modified for swimming

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