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Re: Aussie therizinosaurids?
It said that a characteristic of
Therizinosaurs is a large, bony crest on the humerus, the deltopectoral
Conspicuous by its absence is the lack of a sigmoidal shaft - courtesy of
the distal "twist", which is quite obvious in the humerus of _Erlikosaurus_.
Also in therizinosauroids, the humerus has a pointed internal tuberosity
on its proximal end. This cannot be discerned in the Aussie bone.
So possibly, this is an
Therinosaur and based on relative proportions between the humerus of
Erlikosaurus and this beast, it was 1,5 times as big as that beast.
Based on the illustration, the humerus could come from a range of theropod
Not something you want to come across in a dark alley!
I think the biggest danger of encountering a therizinosaur in a dark alley
would be if it trod on you by mistake. These large-bodied mega-clawed
theropods seem to have been ponderous leaf-eaters.
And with Kakuru being a Avimimid,
I think this goes back to Greg Paul's _Predatory Dinosaurs of the World_,
and is based on the similar proportions of the respective tibiae. Like
_Avimums_, the shin bones of _Kakuru_ were very slender. I think we'll need
more _Kakuru_ bones before we can be certain what this theropod was.
Australia becomes even more
interesting with this discovery, I hope, with [Ozraptor] being a
possible ancestor to the the raptors,
According to at least one palaeontologist, _Ozraptor_ is indeterminate and
the evidence for its inclusion in the Maniraptora is weak.
the giant Alvarzsaurid Rapator,
This has not been published (AFAIK), but seems to be a safe bet.
the Euhelopid Rhoetosaurus,
This has been mentioned (or at least alluded to) to in several scientific
articles. _Rhoetosaurus_'s referral to the Euhelopodidae is based
principally on caudal morphology, I believe - especially, the presence of
forked (or "skid-like") chevrons. However, considering the doubt
surrounding the monophyly of Euhelopodidae (sensu Upchurch), the referral of
_Rhoetosaurus_ to this family (or to Shunosaurinae sensu McIntosh, which
Upchurch combines with _Euhelopus_ in the Euhelopodidae) is very tentative.
Those forked chevrons are also found in diplodocids, and apparently pop up
in a number of sauropod taxa.
the Titanosaurian "Hughenden Brachiosaurid" (could the new
partial skeleton be of this critter?) and Austrosaurus,
_Austrosaurus_ might be a titanosauriform - though, again, this placement is
Alas, Australia's only alleged prosauropod (_Agrosaurus_) appears to have
hailed from Britain, and to belong to _Thecodontosaurus_. Its Antipodean
provenance was nothing more than a case of specimen mislabelling. This
means that Australia is the only continent not to have documented any
prosauropod material. They've even been found in Antarctica.
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