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Re: Laelaps and Brontosauria (was Re: Resending)
--- Tim Williams <email@example.com> wrote:
> You are correct when you say that Olshevsky put ALL prosauropods and
> sauropods into his Brontosauria. In fact, the only real reason Olshevsky
> erected "Brontosauria" was because he also thought segnosaurs were
> sauropodomorphs, and he need a name for the non-segnosaur sauropodomorphs.
> Take out the Segnosauria (as he later did), and
Why not just abandon Brontosauria? It's original announcement was because of a
relationship between therizinosaurs and sauropodomorphs. Clearly, no one is
advocating that anymore.
Also, it's based on Brontosaurus, itself invalid by synonymy.
We already have the names Plateosauridae, Plateosauria, Prosauropoda,
Anchisauria - The topologies
of all of which could change following a revision in cladistics. Eg.
proposed in 2004 for the Anchisaurus + Melanorosaurus clade assumed a close
these taxa; now 1 year latter, Anchisauria could include Anchisaurus and all
excluding Saturnalia, Thecodontosaurus, Plateosauridae, & Massospondylus. See
http://dml.cmnh.org/2005Aug/msg00240.html for this.
If topolgies are changing all the time, i'd take that to mean that the
stable. Until they become stable, i see little point in introducing new names
reusing/redefining redundant names beyond their original context.
> Thus, a Prosauropoda+Sauropoda clade under current topologies would not have
> *exactly* the same content as Brontosauria sensu Olshevsky. However, I
> tip-toed around this by saying the new Brontosauria would have
> *approximately* the same content as the old. A few basal sauropodomorphs
> would certainly fall out - but probably no more than two or three
> (_Thecodontosaurus_, etc) , and the vast majority of sauropodomorphs would
> stay inside Brontosauria. So, this new Brontosauria would retain almost all
> of its original content. And what's a few genera between friends? :-)
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