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RE: Oviraptorids as Parrots?
you're mistaken about tiger shark morphology (or confused by vernacular
taxonomy; look up Galeocerdo cuvieri); they're broad, laterally hooked
and multi-cusped sawteeth and, as was pointed out earlier, the cutting
force of the bite is provided by lateral head-shaking rather than jaw
adduction. The teeth are similar in Cretaceous Hexanchidae except that
there's a row of biggish cusps graded in size, while one cusp dominates
Dr John D. Scanlon
Riversleigh Fossils Centre, Outback at Isa
19 Marian Street / PO Box 1094
Mount Isa QLD 4825
Ph: 07 4749 1555
Fax: 07 4743 6296
From: Jaime A. Headden [mailto:email@example.com]
Sent: Sunday, February 05, 2006 11:13 PM
Subject: Re: Oviraptorids as Parrots?
Dann Pigdon (firstname.lastname@example.org) wrote:
<When you can bite through the shell of a marine turtle, there are few
resources that are beyond you... :)>
However, most marine turtles are of the "soft-shell" variety, without
extensive plate-shaped bones as in land turtles. This makes getting
marine turtle's shell rather easier than, say, a box turtle's or a
Furthermore, while jaguars may make good analogies, also consider that
are adapted for killing by biting into the skulls of their prey, and
necessarily be preadapted to biting through turtleshells.
Tiger sharks, on the other hand, are much less selective in their prey
this have driven the lack of an adaptive dietary feature of the teeth,
their teeth are slender, carinate, and semi-conical, capable of
piercing, and griping without much problems. Other sharks such as blue
great white (pointer) sharks are adapted to taking long massive chucks
once, and their teeth are deisgned to go for prey much larger than the
their jaws. They don't try to gulp prey, like most hammerheads do, in
but by shearing chunk after chunk.
Jaime A. Headden
"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)
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