Coelurosaur ischium unique?

["Ken Kinman" <kinman@hotmail.com>]

   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).

    And the flipside (converse?) of this question is---Are there any 
non-coelurosaurs which also display at least two of those three ischial 
characteristics?
    If the answer to the first question is yes and the answer to the second 
question is no, then the combination of any two (of the three) 
characteristics would be diagnostic for coelurosaurs (and only for 
coelurosaurs).  It would thus be unique.
       -----Thanks, Ken Kinman
P.S.   I haven't found any exceptions yet, but I have this unsettling 
feeling that there may be exceptions to such a uniquely diagnostic 
coelurosaur ischium (especially non-coelurosaurs which might possess two of 
the three).


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