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RE: eggshells, therizinosaurs & tyrannosaurs



Doc Tom Holtz wrote:

<<You mean "sensu Sereno".  Maniraptora sensu stricto
is "modern birds and all taxa closer to modern birds
than to Ornithomimidae": see Gauthier 1986.>>

Ken Kinman wrote:

<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).>

  In the strictist sense, Maniraptora would only
entail those taxa that meet the criteria for the
definition. Onbe can then say that the broader sense
would include taxa of similar form, but do not meet
the criteria. This is to include the sense of
maniraptoran-like forms that are phylogenetically
close, or proposed to be. This would be *Coelurus*,
etc. Gauthier's definition corresponds to Maniraptora,
only the inclusion of taxa chanbed, such as putting
*Ingenia* and *Macrophalangia* with *Ornithomimus* and
not *Oviraptor.* Holtz (1995, 1996) redescribed the
phylogeny of the Maniraptora, coining
Maniraptoriformes to include all taxa that share
ancestry with birds and *Ornithomimus.*

  Sereno has not coined a new definition, and it would
probably be ignored if he did.

<Sereno does not seem to follow Gauthier's definition
of Maniraptora, and instead uses a new clade name,
Tyrannoraptora.>

  Sereno's Tyrannoraptora corresponds to "all taxa
sharing a most recent common ancestor with
*Tyrannosaurus* and birds, and all descendants of that
ansector". It is defined as a separate group, and
exists whether tyrannosaurs or ornithomimids are
closer to birds than the other. Only the possible
monophyly of ornithomimes and tyrannosaurs would
displace Sereno's taxon. Thus, Tyrannoraptora includes
Maniraptora, and in Sereno's phylogeny (1999) is
included by Maniraptoriformes and Coelurosauria, etc.

=====
Jaime "James" A. Headden

  Dinosaurs are horrible, terrible creatures! Even the
  fluffy ones, the snuggle-up-at-night-with ones. You think
  they're fun and sweet, but watch out for that stray tail
  spike! Down, gaston, down, boy! No, not on top of Momma!

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