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WHAT are segnosaurs?
Thank you for testing a null hypothesis. But I suspect that
similarities between prosauropods and therizinosaurs are going to turn out
to be plesiomorphic, and therefore rather tenuous and unconvincing.
What I envision is therizinosaurs as stem tetanurans (perhaps small
unknown primitive forms being stem neotheropods), and eventually grading
into primitive coelurosaurs and even primitive bullatosaurs (ornithomimids
Therefore instead of comparing therizinosaurs to prosauropods, it
might be more interesting to compare them to Guaibasuarids, Coelophysids,
Sinraptorids, and/or basal coelurosaurs such as Ornitholestes. I suspect
that Beipaiosaurus may be a rather advanced therizinosaurian (whether the
latter is a paraphyletic group or polyphyletic).
If therizinosaurs (as now envisioned) are actually polyphyletic or
even highly paraphyletic, splitting them into a number of separate OTUs may
become necessary (but then the fragmentary nature of most forms would become
extremely problematic). But I would especially like to see some concerted
attempts to compare various therizinosaurians particularly with sinraptors
and primitive coelurosaurs (as opposed to prosauropods which are probably
Just a suggestion,
From: "Mickey Mortimer" <Mickey_Mortimer11@msn.com>
Subject: Re: maxillary fenestration & WHAT are "segnosaurs"?
Date: Thu, 28 Jun 2001 21:02:50 -0700
Tracy Ford wrote-
> 2) I have no problem with the jaw being a therizinosaurid, its the rest
> the skeleton that I have a problem with. The jaw is to small to go with
> skeleton (as I've said numerous times on the list).
I'm preparing a big list of theropod characters present in segnosaurs and
going to put segnosaurs in a prosauropod matrix, but until then....
As I wrote before-
Strange that the skull would be too small when the authors state the
is 65% of femoral length, which they point out is larger than other
How can the skull be too small in this case?
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