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[[Category:Polycotylids]] ...

...of the [[Western Interior Seaway]]. ''Edgarosaurus'' was one of the first polycotylids that evolved to become native to the Western Interior Seaway. [[Category:Polycotylids]] ...

...oup]] of the elasmosaurids based on these similarities, thus implying that polycotylids and pliosauroids evolved their short necks independently.<ref name="carpent F. Robin O'Keefe likewise included polycotylids in the Plesiosauroidea in 2001 and 2004, but considered them more closely r ...

...h side (diagnostic of [[leptocleididae|leptocleidids]] and [[polycotylidae|polycotylids]], but not strongly differentiated in [[elasmosauridae|elasmosaurids]]), an ...n S-shape, a trait also seen in ''[[Leptocleidus]]'', ''[[Hastanectes]]'', polycotylids, and the elasmosaurid ''[[Wapuskanectes]]'', but not in ''[[Nichollssaura]] ...

[[Category:Polycotylids]] ...

...ter group]] of the elasmosaurids based on similarities, thus implying that polycotylids and pliosauroids evolved their short necks independently.<ref name="carpent ...

* indeterminate [[Polycotylidae|polycotylids]] (shorter-necked) ...

...ave produced a significant number of pliosaurid and polycotylid skeletons. Polycotylids are especially well represented, ... '''Elasmosaurs''' were about equally a ...