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Re: Re: Fuel for another debate
>Compare tyrannosaurs to dromaeosaurs (Deinonychus, Velociraptor,
>Troodon) which had fairly long arms and 3-fingered hands, which are
>fairly obviously useful as grappling hooks to hang onto the bodies of
>larger prey while slashing with the scimitar claws on the hind feet.
Troodon is not a dromaeosaur, but is closer to the ornithomimids than it is
to Deinonychus, Velociraptor, etc. Its sickle-claw is not particularly big,
and there are serious doubts that it tackled its prey in a dromaeosaurid
manner. In fact, stay tuned for this years Society of Vert Paleo for a new
interpretation of the life habit of the Troodontidae.
>Don't forget `Deinocheirus' -- known only by its huge, razor-clawed
>multi-dactyl hand and arm. Is it likely to come from a T.rex - sized
>dromeosaur? How did it get so big, using the grasping-hand architecture,
>if T.rex could be more successful/numerous using the tiny-hand architecture?
Forget the common myths about Deinocheirus - its claws are anything but
"razor-clawed". In fact, its claws are very blunt, and the whole anatomy of
the animal is identical to that of a giant ornithomimid. Its life-style was
probably closer to a giant ground sloth than a super-raptor like Utahraptor.
Thomas R. HOLTZ
Vertebrate Paleontologist, Dept. of Geology