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Re: Dinosaurs burrowed to keep warm
Dann Pigdon wrote:
I haven't read the paper itself, but apparently the robust forelimbs and
structure of the jaw may be adaptations for some sort of digging activity.
There's adaptations in the pelvic region too. As digging adaptations in
_Oryctodromeus_, the authors mention a wide, fused premaxillae (to loosen or
move dirt); robust scapula with a prominent acromion process and scapular
spine (for muscle attachments); and a strengthened 'fulcrum' in the pelvic
region (including seven sacrals, and expanded proximal caudals).
Several of these features are also seen in _Zephyrosaurus_ and _Orodromeus_,
and (not surprisingly) the phylogenetic analysis recovers these two and
_Oryctodromeus_ as a clade. This clade might have been specialized for
digging, say the authors. The clade comes out near the base of the
Euornithopoda, above an _Agilisaurus_-_Yandusaurus_-Othnielia_ clade, and
below other "hypsilophodont-grade" ornithopods.
There's no mention of _Drinker_. I had a vague recollection that Bakker had
mentioned that _Drinker_ had been found in burrows, but I don't know if this
was actually published (at least scientifically).
I wonder whether the tails of these species were less stiffened than the
No mention of that. In fact, the base of the tail is reinforced.
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