[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: PACHYRHINOSAUR LINEAGE
On Tue, 5 Mar 1996, Jeffrey Martz wrote:
> So: Achelousaurus is tied to Pachyrhinosaurus by the bosses, and
> Einiosaurus is tied to Achelousaurus by the fact that both genera only have
> spikes on the frill. Also, the supraorbital horncores in all three genera
> are apparently lost otongenetically (the younger animals have them but loose
> them as they grow older).
Right. _Pachyrhinosaurus_ also shows the two frill-spikes, but they are
rotated so that the tips point outwards. As I recall, _Achelousaurus_
shows bosses over the eyes as well as on the nose.
> LN Jeff
Pacific Lutheran University
Tacoma, WA 98447