Assertion: true plesiosaur | /r/HasProperty | both long-necked elasmosaurs
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Source sentences:
text: The common name 'plesiosaur' is applied both to the 'true' plesiosaurs (Suborder Plesiosauroidea) which includes both long-necked (elasmosaurs) and short-necked (polycotylid) forms and to the larger taxonomic rank of Plesiosauria , which includes the pliosaur