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maniraptoran pubic retroversion
One of the evolutionary trends that seem to distinguish maniraptors is
the development of mesopuby and/or opisthopuby. The major exception seems
to be the oviraptorosaurs.
The question is whether oviraptorosaurs are primitively propubic, or
if they (as recently topologies might suggest) they evolved de-retroverted
pubes as a reversal. Is there anything in their pubes that might suggest
secondary propuby (de-retroversion) as opposed to primary propuby? The
same question might be asked about some troodonts, varying from mesopuby to
propuby (but again is this a de-retroverted secondary propuby?).
I guess what I am asking is whether mesopuby-opisthopuby is perhaps a
good synapomorphy of Maniraptora, with reversals in oviraptorosaurs and some
troodonts. If so, what might be the reason for such a reversal?
----- Thanks, Ken Kinman
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