Jim, I did not say that the size difference was the only difference. There are a few anatomical differences as well, most prominent of these being the downward flex in the first third of the tail.
>From: "James R. Cunningham"
>To: c_pearsoll@hotmail.com
>Subject: Re: Morrison Sauropods\etc.
>Date: Thu, 05 Jul 2001 20:52:57 -0700
>
>If a Shetland Pony, a Belgian, and a Clydesdale can be the same species,
>then why not these two animals if size is the only difference?
>
>Jim
>
>Christopher Pearsoll wrote:
>
> > And then there is the considerable size differential between
> > Seismosaurus hallorum and Diplodocus carnegii. I will grant the
> > dinosaurs probably grew throughout their lives, but this is a bit
> > much. I would have to say that Seismosaurus is most likely a valid
> > genus.
>
>
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