Assertion: plesiosaur's skeleton | /r/CapableOf | lack the skull
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Source sentences:
text: William Parks described a new species in 1928, Albertosaurus arctunguis, based on a partial skeleton lacking the skull excavated by Gus Lindblad and Ralph Hornell near the Red Deer River in 1923, but this species has been considered identical to A. sarcophagus since 1970.