Siamo a probable Sinraptorid was [R: Tyrannosaurs, dwarf, early, and otherwise...]

["Alessandro Marisa" <amaris@tin.it>]

-----Messaggio originale-----
Da: Thomas R. Holtz, Jr. <th81@umail.umd.edu>
A: Alessandro Marisa <amaris@tin.it>
Cc: dinosaur@usc.edu <dinosaur@usc.edu>
Data: martedì 13 luglio 1999 18.49
Oggetto: Re: R: Tyrannosaurs, dwarf, early, and otherwise...


>At 06:28 PM 7/13/99 +0200, Alessandro Marisa wrote:
>>Sorry, but I don't think that Siamotyrannus is an earliest Tyrannosaurids,
I
>>think that _Siamo_ is a Sinraptoridae, there are some evidence in the
pelvic
>>girdle.

>There are indeed reason to question the tyrannosaurid placement of
_Siamo._.
>However, the condition of the oburator notch in it and in _Sinraptor dongi_
>is a bit problematic (especially in the latter: is it real, pathological,
or
>postmortem damage?).  Are there other derived pelvic characters you have
>noticed linking _Siamo._ and Sinraptoridae?


The ilium of _Siamo_ is virtually identical to those of _Allo_ and
_Sinraptor, the dorsal margin is quite straight as in Allosauroidea, the
pubic peduncle is long and point cranioventrally as in Allosauroidea unlike
the pubic peduncle in Tyrannosauridae, and the supracetabular ridge
overhangs the ischiatic peduncle quite strongly, as in Allosauroidea.
I have noted this features after I have read a question about the fact that
Siamo is a Sinraptoridae on this list, however, I don't finish to prepar the
file of Sinraptor in my computer, when I finish I can compare all the known
bone very well.

P.S
Apart from the prelimnary description of  Siamo in "NATURE" there are other
pubblication about this animal?

By
Alessandro Marisa
 "Volunteer of Paleontological Museum of Monfalcone"
Via Achille Grandi n°18
38068 ROVERETO (TN) ITALY
Tel: 039-0464-434658 Email: amaris@tin.it