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Re: Stegosaurus species

>My Web site currently lists _Stegosaurus_ _ungulatus_ as a junior synonym
>of _Stegosaurus_ _armatus_.  It has recently been suggested to me that they
>have different numbers of tail spikes (four and two respectively), thus
>precluding them from being in the same species.
>Is this argument valid?  Do they really have different numbers of tail
>spikes, or is this only an *apparent* difference to the _S. armatus_
>skeleton being incomplete?  Or is something else going on here?  Certainly
>Galton in Weishampel's _The Dinosauria_ makes them synonyms.  It seems
>unlikely to me that he would make such an elementary error.

Has there been any suggestions of sexual dimorphism in stegosaurs?  Could this 
be the reason that the two species were sunk together?

Rob Meyerson

Evil triumphs where good men do nothing.