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Re: Re: Therizinosaurus
>>>Giganotosaurus is, I belive, Cenomanian, so it is indeed a little younger
>Other giant non-tyrannosaurid theropods include the ?allosaurid
>Chilantaisaurus, the allosaurid Saurophaganax, the megalosauroid Torvosaurus
>(=Edmarka), Carcharadontosaurus, Bahariasaurus, Spinosaurus, and
> Oops, forgot Therizinosaurus, too.<<
>Therizinosaurus? I recall that there was evidence that _Therizinosaurus_
>isn't a theropod at all. Some say, and I trust, that Therizinosaurus is
>really an herbivorous segnosaur, a late-surviving relative of the
Recent discoveries by Dale Russell and others point (arguably) to a theropod
origin for the Therizinosauroidea (formerly Segnosauria).
> Those claws did not really look like they were suited for
>killing; I don't think the claws were really THAT sharp and efficient.
Being a theropod does not automatically make you a predator. Several
theropod lines (ornithomimid, troodontid, oviraptorosaur, therizinosaur, and
many, many lines of birds) evolved omnivory, herbivory, molluscivory, and
>or less, like the iguanodont spike-thumb, Therizinosaurus's claws, if it was
>indeed a segnosaur, were probably for defense against predators...
The claws of Therizinosaurus are the most blade-like of any theropod. As
well as defense, they may have served in some manner for food procurement.
>Then again, I may be wrong.
No, you just mention one of a couple of possibilities.
Thomas R. Holtz, Jr.
Dept. of Geology
University of Maryland
College Park, MD 20742