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New taxon (and taxonomy) from Sereno's Science paper
Something I forgot from my previous posting:
Sereno coins a new taxon, Tyrannoraptora, defined as "_Tyrannosaurus_,
Neornithes, their most recent common ancestor, and all descendants." A good
name (seems to me I've heard the phrase "tyrannoraptor" somewhere before...
:-). Of the three main competing hypotheses of tyrannosaur origins, it is
useful (a non-synonym) in two:
Model I: Tyrannosauridae is outside _Ornithomimus_ + Neornithes. In this
case, Tyrannoraptora includes Maniraptoriformes.
Model II: Tyrannosauridae is closer to _Ornithomimus_ than to Neornithes.
In this case, Tyrannoraptora is a junior subjective synonym (same clade,
different definition) of Maniraptoriformes.
Model III: Tyrannosauridae is closer to Neornithes than to _Ornithomimus_.
In this case (the one in Sereno's paper), Tyrannoraptora is technically part
of Maniraptora (but Sereno is using his "redefined" Maniraptora).
Sereno also provides new redefinitions for:
Ornithomimidae (all ornithomimosaurs closer to _Ornithomimus_ than to
Ornithomimoidea (_Shuvuuia_, _Ornithomimus_, their most recent common
ancestor, and all descendants);
Alvarezsauridae (all ornithomimosaurs closer to _Shuvuuia_ than to
Therizinosauridae (all maniraptoriforms closer to _Erlikosaurus_ than to
_Ornithomimus_, _Oviraptor_, or Neornithes [not fond of more than two anchor
taxa, but this one kinda works for me, in that it covers most of the bases...]);
and Oviraptoroidea (_Oviraptor_, _Caenagnathus_, their most recent common
ancestor, and all descendants).
Thomas R. Holtz, Jr.
Deptartment of Geology Director, Earth, Life & Time Program
University of Maryland College Park Scholars
College Park, MD 20742
Webpage: http://www.geol.umd.edu Phone:301-405-4084
Email:firstname.lastname@example.org Fax: 301-314-9661