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Re: Spinosaurus: The dino-daddy of all meat eaters



It's interesting to speculate as to whether or not
tyrannosaurs may have reached Spinosaurus size if
their evolution had not been prematurely snuffed out
by the K-T extinction event.  Tyrannosaurs were
certainly heading in that direction, and had
tyrannosaurs existed another 10-20 million years,
perhaps they would have approached such sizes... :-0  

Guy Leahy

--- Mike Harrison <mikevharrison@yahoo.com> wrote:

>
http://www.newscientist.com/article.ns?id=mg18925384.600
>         The dino-daddy of all meat eaters    
>    13 February 2006   
>    From New Scientist Print Edition   
>    Jeff Hecht 
>      Battle of the beasts
> 
>   THE biggest, and possibly the baddest predatory
> dinosaur of them all was not the fabled
> Tyrannosaurus rex, or even its slightly larger rival
> Gigantosaurus, but a long-jawed, sail-backed
> creature called Spinosaurus.
>   An examination of some newly obtained fossils
> shows that Spinosaurus stretched an impressive 17
> metres from nose to tail, dwarfing its meat-eating
> relatives. As well as being longer than its rivals,
> Spinosaurus also had stronger arms with which to
> catch its prey, unlike the puny-armed T. rex and its
> ilk.
>   Until 10 years ago, T. rex held the mantle of the
> biggest predatory dinosaur. Of the 30 specimens
> collected so far, the largest and most complete is a
> fossil called Sue, kept at the Field Museum of
> Natural History in Chicago. She measures 12.8 metres
> long and is thought to have weighed 6.4 tonnes when
> alive 67 million years ago.
>   Enter Gigantosaurus, a meat-eating dinosaur that
> lived in what is now Argentina. Reconstruction of a
> partial skeleton indicated that it stretched 13.7
> metres. It lived about 100 million years ago at
> around the same time as two other huge predatory
> dinosaurs were stalking other continents.