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RE: eggshells, therizinosaurs & tyrannosaurs
We do have to remember, though, that even within clades (such as Squamata
or But from what little I have gathered so far, these differences are
just variations of the broader types. The neognath bird type is apparently
a distinctive variation of the ornithoid type.
Aves) you can get different shell structure morphology.
The overall ornithoid morphology is apparently distinctive enough to
be of important phylogenetic value, one which I am surprised
dinosaurologists don't emphasized more strongly. To me this evidence seems
more clearcut and less vulnerable to counterargument than something like
digit homologies or even the semilunate carpals (ooops, probably will get
criticized for saying that, but right now I am more impressed by the
You mean "sensu Sereno". Maniraptora sensu stricto is "modern birds and
all I just meant that Maniraptora "sensu Sereno" is "sensu stricto" (in the
least inclusive sense), whereas "sensu Gauthier" would be sensu lato (a more
inclusive sense, at least using Sereno's phylogeny).
taxa closer to modern birds than to Ornithomimidae": see Gauthier 1986.
Sereno does not seem to follow Gauthier's definition of Maniraptora,
and instead uses a new clade name, Tyrannoraptora. Apparently another case
of cladistic disunity on what definitions to use!!?? In any case, I guess
it would be better to say sensu Sereno (it would have admittedly been less
confusing if I had said that).
Cheers, Ken Kinman
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