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According to Peter Dodson, the namer of _Avaceratops_, _Avaceratops_ is
a sub-adult, nearly full grown member of a distinct species (based on a
fully fused occipital condyle).
Jack Horner claimed at one time that he had a whole series of
_Breveceratops_ that included _Avaceratops_ as a juvenile member. He has
not come forward with any papers about this so-called series, and has not
mentioned it in private conversations or public talks - for at least 4 years
Personally, based on the parts of _Avaceratops_ that I have seen, and on
the decent reconstruction (not exceptionally good) of the animal, I am
inclined to agree with Peter's interpretation.
From: T. Mike Keesey <firstname.lastname@example.org>
To: Lawrence Akins <email@example.com>
Cc: firstname.lastname@example.org <email@example.com>
Date: Sunday, February 01, 1998 3:06 AM
Subject: Re: Avasaurus
>On Fri, 30 Jan 1998, Lawrence Akins wrote:
>> Last I remember hearing about Avasaurus, is that it is not known whether
>> it is an adult or a juvenile. I was just wondering if anyone has any
>> information on it.
>Do you mean _Avisaurus_ (an enantiornithine) or _Avaceratops_ (a
>Last I heard, _Avaceratops_ was a juvenile, possibly of another
>--T. Mike Keesey
>http://umbc.edu/~tkeese1 -- Dinosaur Web Pages