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Fw: digits was: Sneak Peak at Yale Torosaurus Sculpture
Mickey asked me to forward this. His server is acting up.
----- Original Message -----
From: "Michael Mortimer" <firstname.lastname@example.org>
Sent: Tuesday, September 27, 2005 6:32 PM
Subject: RE: digits was: Sneak Peak at Yale Torosaurus Sculpture
> Cliff Green wrote-
> > Thank you for the great information. I suppose I stand corrected on
> >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
> >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?
> Your're right about hadrosaurid manus configuration (no digit I, digits
> II-IV joined, digit V divergent). Horner et al. claim digits IV and V end
> in unguals, describing the one on IV as elongate with an arcuate cranial
> margin and V as being ovoid. I can't confirm this though, as my
> postcranial literature is lacking. It's not at all analogous to
> As for stegosaurs, Stegosaurus is said to have cartilaginous terminal
> phalanges on digits III-V (Galton and Upchurch, 2004). Most other
> stegosaurs don't preserve much manual material.
> The ankylosaur Liaoningosaurus seems to have an ungual on its fourth
> but the brief description and small figure make this uncertain (Xu et al.,
> 2001). Other ankylosaurs are said to have from 3-4 phalanges on digit IV,
> so I wouldn't put it past them to have unguals there too. But I lack
> Maryanska (1977), so can't tell at the moment.
> Ceratopsids are said to lack unguals on digits IV and V by Penkalski and
> Dodson, which is why they were insure about Avaceratops.
> Mickey Mortimer