Re: Coelurosaur ischium unique?

["Mickey_Mortimer11" <Mickey_Mortimer11@email.msn.com>]

Ken Kinman wrote-

>     Does the coelurosaur ischium always possess at least two of the
> following three features?   Each of these features is occasionally lacking
> in a few coelurosaurs, but I believe that all coelurosaurs have at least
two
> of the three (and most would have all three):
>      Ischium (1) reduced to less than 2/3 length of the pubis; (2) lacking
> an ischial foot; and (3) possessing a prominent, triangular obturator
> process (placed more than 25% down the ischial shaft).

Ornithomimids and Compsognathus have 3 but not 1 or 2.  Scipionyx lacks at
least 1 and 2.  Sinosauropteryx lacks all of them.  Many ornithothoracines
will lack 1 and 3, but still have 2.

>      And the flipside (converse?) of this question is---Are there any
> non-coelurosaurs which also display at least two of those three ischial
> characteristics?

I don't think so.

Mickey Mortimer