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Re: Haplocheirus and Gregory S. Paul
However, the notion of "neoflightless" deinonychosaurs is not the most
parsimonious explanation for the character distribution seen across Maniraptora.
Wouldn't you agree that, since a 4-winged configuration is now seen in the
basalmost and/or oldest members of the dromaeosaurs (Microraptor) and
troodontids (Anchiornis), and since their sister group is the Avialae, that it
is far more likely that they all three inherited aerodynamic behaviors from the
ancestral paravian than that they each acquired them independently? I know that
we must hold out the possibility that Microraptor and Anchiornis didn't glide,
but the body masses are so small, the arms are so long, the sterna are so big
and ossified, and the feathers are so long and form such large wings that it
really seems more likely than not that they glided.
If you do agree, then aren't the larger, more derived deinonychosaurs
If so, aren't "neoglideless" deinonychosaurs the most parsimonious explanation?