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Re: two hadrosaurid papers on Notebook on Geology
--- On Sun, 7/19/09, Ignacio Ruiz <email@example.com> wrote:
Letter 2 : Evidence of predation on the vertebra of
> hadrosaurid dinosaur from the Upper Cretaceous (Campanian)
> Coahuila, Mexico, by Hector E. RIVERA-SYLVA, Eberhard FREY
> & Jose
> Ruben GUZMAN-GUTIERREZ. - Reference: [CG2009_L02], 6 p.
> Abstract: In sediments of the Aguja Formation (Late
> Campanian) at La Salada in northern part of the state of
> Mexico, numerous fossils of vertebrates have been
> discovered including
> Hadrosauridae. One hadrosaur vertebra provides evidence of
> probably by a giant alligator Deinosuchus riograndensis.
There is a rather dramatic picture associated with this paper. It features a
_Deinosuchus riograndensis_ attacking a startled _Kritosaurus_ sp. The picture
illustrated a point I never really thought about before. Given that the major
leg retractor muscle for dinosaurs, ran along the length of the tail; an attack
on the proximal portion of that body part would seem to be the equivalent of
hamstringing an ungulate. Especially if it was done by a critter like
_Deinosuchus_, which has a hugely powerful bite force potential.
I wonder if this made dinosaurs more vulnerable than mammals, for this
particular style of attack.