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At 02:55 PM 6/23/98 -0400, Ralph "Morph-man" Chapman wrote:
>I indeed intended to say that the nail was in the coffin of the non-dino
>theory of brid origins. The new beasts are incredibly strong evidence for
>birds as theropod dinosaurs. Just wanted to pick them up and take them
>home (NMNH is home here), which I told Phil at the press conference.
Too bad I didn't drive there: I could fit the slabs in the back of my Honda
>I will go to the exhibit when I return from Connecticut for a week's
>vacation. if others go, please let us know what the other three
>specimens are. I believe at least one is Sinosauropteryx, but don't know
>what the other two are.
There will be two Sinosauropteryx specimens on display: the type and the
third (largest) specimen. I presume the third critter will be a
Confuciusornis, but will see soon enough.
Still a bit in awe over the critters... Given that the paper is now
computer accessible (but NOT in the "public domain", as someone said: that
is something different with regard to copyrights), here are some of the
Neither form has a distally placed retroverted pedal digit I: these were not
perchers, and indeed had typical nonavian theropod feet. Protarchaeopteryx
is fairly long-armed (Arm/Femur ratio of 2.5, comparable to the longest
armed dromaeosaurs), whereas Caudipteryx is very short armed (Arm/F of 1.5,
on the low end of oviraptorosaurs). The teeth of Protarchaeopteryx look
like serrated versions of Archaeopteryx teeth, but Caudipteryx teeth are
very unusual: long and slender. The ischium of Caudipteryx is very
dromaeosaur or oviraptorosaur like: no sign of the posterodorsal process
found in Archaeopteryx and more advanced birds. The dentary of Caudipteryx
is reminiscent of oviraptorosaurs in shape, and to a certain degree
resembles that of Shuvosaurus (!?!?!), but this does not necessarily imply
close relationships with either.
The phylogenetic analysis Ji et al. published did not include any non-avian
theropods other than velociraptorines, nor does it include Unenlagia or
Rahonavis. It will be interesting to see where these guys fall out in a
more inclusive analysis...
Thomas R. Holtz, Jr.
Vertebrate Paleontologist Webpage: http://www.geol.umd.edu
Dept. of Geology Email:email@example.com
University of Maryland Phone:301-405-4084
College Park, MD 20742 Fax: 301-314-9661