Re: Avaceratops and Ceratops (was Re: THE NEW ISH OF JVP)

[Mike Keesey <tmk@dinosaur.umbc.edu>]

On Tue, 25 Jan 2000, Jaime A. Headden wrote:

>   Unless such a group is polyphyletic. If phylogeny
> supports a
> 
> *Zuni*--------\_
> *Ava*--\___   /
> *Cera*-/   \_/
> *Chasmo*-\_/
> *Centro*-/
> 
> clade, then it might be more supportable for a new
> family to be coined for Chasmo and Centro, despite
> previous definition and diagnoses of these as
> Ceratopidae.

Why would this be necessary? Use {_Ceratops_ + _Centrosaurus_} to define
Ceratopsinae, and then you can have two or three subfamilies, depending on
the phylogeny.

> Thusfar, we could get a new
> "Chasmosauridae" for this clade, and name the node
> that supports Zuni + Chasmo.

That one has already been named Ceratopsomorpha (and unfortunately, it's
probably inside Ceratopsoidea [=={_Montanoceratops_ + Ceratopsidae}]).

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