[mailto:email@example.com]On Behalf Of HPB1956@aol.com
Sent: Saturday, December 22, 2001
Subject: Re: Scipionyx position
L. Ford wrote on 12/21/2001:
It is considered a basal coelurosaur because of the presence of the following
primitive features: prefrontal well-developed; lacrimal robust; acromion
present, rounded coracoid ;ischial distal expansion (ischial foot?); 4th
trocanter weakly developed ; unexpanded , thin v-shaped chevrons.
These are given in the
IIRC Scipionyx is regarded a juvenile. If true it may lack some derived
characters due to being juvenile. This in turn would automatically lead to a
basal position inside Coelurosauria in a cladistic analysis. BTW in the last
cladogram which Thomas Holtz presented to the DML Scipionyx was found to be the
most basal coelurosaur.
I think to solve this question we have to find a fossil which can be shown to
be the adult form of Scipionyx.
Heinz Peter Bredow <<
me, I never wrote that. I believe I was responding to someone and you thought I
wrote it reply. Another case of being blamed for something I never did L
Tracy L. Ford
P. O. Box 1171