Assertion: plesiosaur's skeleton | /r/HasProperty | lacking skull
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Source sentences:
text: Gr. sauros "lizard")* (m) named to indicate a sea-going elasmosaurid; proposed for "Elasmosaurus" serpentinus Cope, 1877, based on a nearly complete skeleton (lacking skull) from Nebraska (Holotype: AMNH 1495); notable for a massive humerus, indicating a powerful swimmer.