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Re: Tyrannotitan, new carcharodontosaurid from Argentina
Tim Donovan wrote:
Why else would an elongated snout and jaws evolve?
If spinosaurs were more massive and powerful than
carcharodontosaurs, and piscivory seems questionable,
could they have been sauropod hunters, using their
long jaws to reach the necks of titanosaurs or
More likely, spinosaurs targeted small prey...
From Sues et al. (2002):
"The skull of _Irritator_ does not appear to be well-suited for catching and
processing large, resistant prey. Its structure differs from that in other
large theropod dinosaurs such as _Allosaurus_ (Rayfield et al., 2001) and
_Tyrannosaurus_ (Erickson et al., 1996), presumably reflecting different
modes of feeding. Most likely spinosaurid theropods rapidly and forcefully
seized smaller prey, which was then processed by dorsoventral motion of the
head facilitated by the powerful neck musculature. (Extensive side-to-side
striking movements of the head, as employed by extant crocodylians, appear
unlikely in view of the narrow occiput as well as the weak development of
the basal tubera.) Whereas fish formed part of the diet in at least _B.
walkeri_, there is nothing to suggest that spinosaurids were exclusively or
even predominantly piscivorous. Previous anatomical comparisons between the
feeding apparatus of crocodylians and spinosaurid theropods were based only
on superficial resemblances."