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RE: Deinonychus claw use...
> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]
> On Behalf Of email@example.com
> John Ostrom would have loved this paper!
He would have, indeed!!
By the way, any enterprising student (or other!) with access to advanced
troodontid jaws with teeth in them, I offer the following
The authors state:
"The teeth of troodontids are similar to those of dromaeosaurids in that
denticles are reduced or absent on the anterior carina,
with large hooked denticles on the posterior carina , . Troodontid
denticles appear proportionally much larger than those of
dromaeosaurids, and compared to the crown height this is true. However,
troodontids possessed many more teeth in their jaws than
would have a similarly sized dromaeosaurid . For a given fixed jaw length,
troodontid teeth are comparatively much reduced in
size; the crown height of troodontid teeth would have been only about half as
much as those of a dromaeosaurid. Therefore it is
probably more accurate to say that troodontids do not have large denticles;
rather, they have short crowns, with similarly sized
denticles as might be expected for a dromaeosaurid of similar body mass. This
makes sense if denticles have a size below which they
are no longer able to function effectively."
So, a test of this:
Measure denticle size in troodontid teeth (and dromaeosaurid teeth, and a
couple other basal groups for comparison) AND the length
of the tooth row of the same individual. Plot the two against each other.
If the Fowler et al. hypothesis is correct, the troodontid and dromaeosaurid
data will plot with each other. Alternatively, it may
be that the the enlarged denticle size in Troodon et al. will continue to scale
above that of dromaeosaurids even when plotted
against tooth row length rather than a measure of tooth size.
Thomas R. Holtz, Jr.
Email: firstname.lastname@example.org Phone: 301-405-4084
Office: Centreville 1216
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
Faculty Director, Science & Global Change Program, College Park Scholars
Mailing Address: Thomas R. Holtz, Jr.
Department of Geology
Building 237, Room 1117
University of Maryland
College Park, MD 20742 USA