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Re: Hongshanosaurus houi, new psittacosaur

----- Original Message -----
From: <Dinogeorge@aol.com>
To: <dinosaur@usc.edu>
Sent: Wednesday, July 02, 2003 8:08 PM
Subject: Re: Hongshanosaurus houi, new psittacosaur

> Echinodon doesn't have the premaxillary tooth pattern shared by
> heterodontosaurs and later marginocephalians (the premax teeth are lost
>in most ceratopians
> but one or two are still there in Protoceratops and some Psittacosaurus
> species), so I'd place it in a sister group to the others.

Which species of Psittacosaurus possess premaxillary teeth? If this is true
it's a great new for me.

Marisa Alessandro
Via Achille Grandi n°18
38068 Rovereto (TN) Italy