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Ozraptor and Kakuru - Aussie abelisaurs?
Apologies in advance if this paper has been mentioned previously on this
list (I seem to have missed some recent posts):
Rauhut, O.W.M. (2005). Post-cranial remains of 'coelurosaurs' (Dinosauria,
Theropoda) from the Late Jurassic of Tanzania. Geol. Mag. 142: 97?107.
It contains a lot of info about isolated theropod bones from Tendaguru in
Tanzania. No new genera or species are described. Very interesting, with
the Tendaguru theropod fauna dominated by different ceratosaurs. Some
elements hitherto identified as 'coelurosaurs' are re-identified as small
Rauhut briefly discusses two Australian theropods, _Ozraptor_ (Middle
Jurassic) and _Kakuru_ (Early Cretaceous), which have proven difficult to
classify. A small tibia (MB.R 1750) from Tendaguru is identified as coming
from a small abelisauroid, and shares with _Ozraptor_ "the derived character
of a depressed, subdivided facet for the ascending process of the
astragalus". Thus, _Ozraptor_ is identified as a Middle Jurassic
abelisauroid. If the identification is correct, it indicates a pre-Bajocian
divergence for ceratosaurids and abelisauroids.
The little theropod _Kakuru_ has a "flattened anterior side of the distal
end of the tibia with a medial vertical ridge", which Rauhut mentions as
possible synapomorphies of small abelisauroids.
A third Aussie theropod, _Rapator_, is mentioned as a possible abelisaur,
and Rauhut cites Molnar (1992). However, there is good evidence that the
isolated "metacarpal" of _Rapator_ is in fact the phalanx of a large
alvarezsaurid (Holtz et al., 2004).