Re: Hairy Hypsilophodontids

["T. Michael Keesey" <mightyodinn@yahoo.com>]

--- "Simon M. Clabby" <dinowight@yahoo.co.uk> wrote:
> 
> Ah, there we are then! I'm stuck in the world of
> Ornithopoda and Neornithopoda, as opposed to the
> correct world of Cerapoda and Ornithopoda!

Actually this gets  a bit complicated.

Cooper 1985 named, among other things, these groups:
Neornithischia (thyreophorans, heterodontosaurids, pachycephalosaurs, and
ceratopsians)
Neornithopoda (heterodontosaurids, pachycephalosaurs, and ceratopsians)

Note that the former would generally be considered non-monophyletic nowadays,
as it lacks ornithopods. The latter is a pretty bad name, since it includes no
ornithopods. I don't know if these taxa were rigorously defined or not; I'm
going by Pete's, er, HP Buchholz's summary here:
http://www.cmnh.org/dinoarch/1997Aug/msg00267.html

Sereno 1986 defined _Cerapoda_ as _Ornithopoda_ + _Marginocephalia_. But Sereno
1997 uses _Neornithischia_ for this clade.

Applying these and some others to what is generally accepted nowadays:

_Genasauria_
|--_Thyreophora_
`--_Cerapoda_/_Neornithischia_ Sereno 1997 non Cooper 1985
   |--_Ornithopoda_
   |  |==(basal stuff)
   |  `--_Euornithopoda_
   |     |--_Hypsilophodon_
   |     `--_Iguanodontia_
   `--Neornithopoda
      |--Heterodontosauridae (OOC, has this ever been defined?)
      `--_Marginocephalia_
         |--_Pachycephalosauria_
         `--_Ceratopsia_

So, make of that what you will. I don't know of anyone currently using Cooper's
taxa or definitions (if there were any; haven't read it).

=====
=====> T. Michael Keesey <keesey@bigfoot.com>
=====> The Dinosauricon <http://dinosauricon.com>
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