[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Claw function in Deinonychus

Positive claw allometry is consistent with a weight
bearing claw function, is it not?

--- "Jaime A. Headden" <qilongia@yahoo.com> wrote:

> Mike Habib <mhabib5@jhmi.edu> wrote:
> <The info above makes it appear as if my hunch was
> wrong (nothing shocking
> there);  I am a bit confused, however, because your
> ratios seem to say the
> opposite...>
>   Ugh, you're right. That comes from writing the
> prelim observations (such as
> working from memory...) then finding measurements of
> the unguals (one from a
> *Megaraptor* paper and another from a press
> comparison of Utah's vs. Deino and
> Vel claws). At which point, I started to try to go
> back and fix my earlier
> comments to conform to the tables. The inference I
> wrote under inverted
> allometry was based on faulty writing, so I blame
> myself for rewording that
> twice and still getting the parsing wrong. Oh well.
> <Thanks for taking the time to gather that prelim
> data!>
>   Sure, no prob. For what it's worth, the
> measurements for *Adasaurus* and
> *Microraptor* follow:
>   At an estimated body length of 1.5m, *Adasaurus*
> has a claw length of 22.5mm,
> which is incredibly small, 0.015 of body length.
> Meanwhile, for the holotype of
> *Microraptor gui*, with a body length of .73m, it
> has a claw length of 15mm, so
> 0.021. And for the type of *Cryptovolans pauli*, we
> have a body length of .75m
> (estimated with slender proportions and a neck and
> neck of roughly equal
> length,  with a claw length of 14.76mm, so 0.02. I
> may have gotten the body
> length wrong, but used Norell et al's figure from
> Nature featuring the
> specimen.
>   Cheers,
> Jaime A. Headden
> "Innocent, unbiased observation is a myth." --- P.B.
> Medawar (1969)
> __________________________________ 
> Yahoo! FareChase: Search multiple travel sites in
> one click.
> http://farechase.yahoo.com