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Re: Revised Ornithischian Classification

Ken Kinman (kinman@hotmail.com) wrote:

<I recognize a dryomorpha clade, but since Gasparinisaura is incertae
sedis (it jumps around in cladograms a lot), I personally think an
euiguanodontia clade is worthless baggage.  Way too many clades based
on Iguanodon as it is.>

  Gasparinisaura does not jump around in cladograms a lot ... it
stays just outside of Dryomorpha, always has since 1996 when
described and included....

  As for "Hypsilophodontidae" there is some support for monophyletic
groups within it that would indicate some unity of some including
Hypsilophodon, but most included taxa are as disparate and spread out
that retaining such a unity would be a very bad idea, based on both
cladistic analysis and personal observation outside of a numeric
matrix ...

  For instance, a Zephyrosauridae, with *Orodromeus*,
*Zephyrosaurus*, and possibly also *Laeallynasaura* --- an
Othneiliidae, with *Othneilia* and *Drinker* --- a Hypsilophodon
which may include both *Yandusaurus* and *Fulgurotherium* as well as
*Hypsilophodon*, but this is questionable --- a Rhabdomorpha that may
include several of the Aussie species as well as *Tenontosaurus* and
*Rhabdodon* --- and *Parksosaurus* close to the base of Dryomorpha
along with *Gasparinisaura*. The positions of the other groups, such
as Zephyrosauridae closer to *Iguanodon* than is *Othneilia*, a very
basal ornithopod position for *Bugenasaura* [always a very basal form
in any alternate position, and never destabilizing any of the other
groups] and *Agilisaurus*, *"Yandusaurus" multidens* is more
variable, and destabilizing to some degree.

Jaime A. Headden

  Where the Wind Comes Sweeping Down the Pampas!!!!

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