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RE: PalAss Meeting
David Marjanovic wrote:
>> Phytosaurs are basal, Aetosaurs are the sister-group of Crocodilians and
>> the Rausuchia are paraphyletic. Most stay on their own branch but some,
>> including Poposaurus group with Ornithosuchia.
> By this, you mean Ornithosuchidae and not Avemetatarsalia, right?
I really hope that Ornithosuchia is permanently defined such that it includes
>> The conclusion was that the tusks were probably not used for intra-species
>> fighting or display, nor for defence, but that heterodontosaurs were
>> omnivores living in semi-arid habitat and used the teeth to kill
>> smallish prey.
I'll second that. Also, if the tusks were already present in juveniles, and
not sexually dimorphic, what does that mean for the tusk-less holotype of
_Abrictosaurus_? Was _Abrictosaurus_ exclusively herbivorous?
A larger, tusked heterodontosaur specimen has also been referred to
_Abrictosaurus_ - so would this represent a new taxon?
Pachycephalosaurs also had caniniform teeth. Did they hunt small prey as well?
You see, ornithischians are *really* interesting. Theropods have no right to
hog the limelight. Nor sauropods (sorry Mike!)
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