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RE: Pterosaur diversity (was: Re: Waimanu)

Tim Williams wrote-

_Ceratops_ (the nominative genus for Ceratopsidae) is probably an invalid genus (nomen dubium). Sereno (2005) is confident that _Ceratops montanus_ belongs to the Chasmosaurinae, based on the size of the horn cores. In fact, he is so confident that he renames this subfamily the Ceratopsinae. Let's hope that big brow horns are limited to chasmosaurines/ceratopsines among ceratopsians.

Zuniceratops and Ryan's (still undescribed?) basal centrosaurine show this isn't so. Large brow horns are plesiomorphic for ceratopsomorphs.

Mickey Mortimer