digits was: Sneak Peak at Yale Torosaurus Sculpture

[Cliff Green <dinonaut@emerytelcom.net>]

----- Original Message ----- 
From: "Michael Mortimer" <mickey_mortimer111@msn.com>
To: <dinosaur@usc.edu>
Sent: Tuesday, September 27, 2005 3:52 PM
Subject: Re: Sneak Peak at Yale Torosaurus Sculpture


> Apparently Heterodontosaurus (Norman et al., 2004), Orodromeus (Scheetz,
> 1999), hadrosaurids (Horner et al., 2004), and perhaps Avaceratops
> (Penkalski and Dodson, 1999) have unguals on manual digit IV.
Hadrosaurids
> are also claimed to have them on digit V.
>
> Mickey Mortimer

Dear Mickey and List,

    Thank you for the great information. I suppose I stand corrected on the
duckbills, but don't most of that clade have a missing first digit, with
numbers two through four fused into a hoof like structure? Is the fifth
digit clawed, or no? I guess with that argument you could say tyrannosaurs
also had unguals on digits four and five, but you can no longer see them
because they evolved away.  Is there evidence of unguals in the forth and
fifth digits of Large ceratopsians, stegosaurs, and armored dinosaurs?

Cliff