[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Reflections on Recent "Dromaeosaurs"

Jaime Headden wrote:

  I have reason to believe that *Utahraptor*, based on
a variety of bones from the same formation that all
yield dromaeosaurid characters pertaining to a
particularly large animal (elongate premaxilla,
T-shaped lachrymal, mediolaterally compressed pedal
and manal claws of very large size relative to
phalanges and limbs, tibia with astragalar facet
having a sub-rectangular outline, caudal vertebrae
with elongate post- and prezygapophyses and the
prezygapophyses longer than one preceeding centrum
[reconstructed?]) suggesting they belong to a single

Yep, all these check out. The prezygapophyeal rods and chevron extensions are elongated, although I don't believe their full length is preserved. The subrectangular frontal elements (in dorsal view) might link _Utahraptor_ to _Dromaeosaurus_ (as suggested by Kirkland et al.).

It has not been suggested they all belong to a
single individual.

Too right!

I feel the avian character of the coracoid and the frontals being more "swollen" than in velociraptorines like *Saurornitholestes*

How do you mean "swollen"? To me, the frontals of _Bambiraptor_ look identical to those of _Saurornitholestes_, at least in dorsal view. (Comparing Sues (1978) and Burnham et al. (2000).)

  I'll say my piece on *Adasaurus* in a different

Ah! This I'll look forward to.



<< | `--+--*Achillobator giganticus* `--+--*Ozraptor subotaii* |?-*Variraptor mechinorum* `--+--*Dromaeosaurus albertensis* `--+--*Utahraptor ostrommaysi / | ostrommaysorum* `--+--+--*Bambiraptor feinbergi / | | feinbergorum* | |?-*Adasaurus mongoliensis* | `--+--*Unenlagia comahuensis* | |--*Rahonavis ostromi* | `?-+--+--*Archaeopteryx | | | lithographica* | | `--*Archaeopteryx | | bavarica?* | `--Neornithes |?-*Sinornithosaurus millenii* `--+--*Deinonychus antirrhopus* `--+--*Velociraptor mongoliensis* `--*Saurornitholestes langstoni* >>

  Note: Sinorn, Vel, and Bambi are radially
represented, caring for my ambiguity on they're
relationship. I changed "Aves" to "Neornithes", per
Mike Keesey's observation. Some other techincal
problems have been resolved (serial *A. bavarica,* *A.
lithographica,* and *Neornithes,* *Rahonavis,* and
*Unenlagia*) with doubt placed on the placement of
*Adasaurus* and *Variraptor.* Oddly enough, Buffetaut
and leLoeuff (1998) did not provide synapomorphies of
Vari and Dromaeosauridae, but some are apparent as
Mickey Mortimer noted in his character analysis last
month (this list).

Jaime "James" A. Headden

"Come the path that leads us to our fortune."

Qilong---is temporarily out of service.
Check back soon.

Do You Yahoo!?
Talk to your friends online and get email alerts with Yahoo! Messenger.

________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com