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I believe in 1926 Nopcsa suggested that ankylosaurs were insectivores.
This has fallen from favor in light of Coomb's and Carpenter's worrk on
ankylosaurs. But I think that in recent years much evidence has been
acculumated to support at least a hebivorous/insectivorous feeding habit
First of all the body style is similiar to modern insect-eating
edentates. Low,armored body style is advantageous because it is easier
to eat bugs and the armor can be used for defence against stings as well
as for defence against predators.
Second of all ankylosaurs had prehensile tongues that flipped in and
out of the mouth like a snake's tongue. The hyoid bones were very well
developed and they had a long entogossal process. I believe in Gastonia
and Pinacosaurus a "scoop" is found in the premaxxila. This would have
allowed the tongue to flip in and out unhindered. This tongue would have
been useful for collecting insects like an anteater.
These features can be made to support a insectivorous lifestyle for
ankylosaurs, but I support the compromsse of a herbivore/insectivore
And while on the subject of ankylosaurs it appears that they possess
conchae (turbinates) and they do not appear to be olfactory conchae. Any
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