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Re: New paper on pre-Archaeopteryx coelurosaurian dinosaurs



On 26 October 2010 10:35,  <bh480@scn.org> wrote:
> Also now available for free at:
> http://digitallibrary.amnh.org/dspace/handle/2246/6087
>
> Daniel T. Ksepka and Mark A. Norell, 2010.
> The Illusory Evidence for Asian Brachiosauridae: New
> Material of Erketu ellisoni and a Phylogenetic
> Reappraisal of Basal Titanosauriformes
> American Museum Novitates 3700: 1–27

Excellent that this is now out.  Of note is that this paper contains
the first phylogenetic analysis to feature a decent hand of putative
brachiosaurids (the best haul prior to this being Upchurch et al.
2004, who had a compound "Brachiosaurus" OTU and Cedarosaurus; and
Taylor 2009, who had separate Brachiosaurus proper and Giraffatitan
OTUS.)

Ksepka and Norell included Brachiosaurus, Giraffatitan, Cedarosaurus,
Paluxysaurus, Abydosaurus and Europasaurus.  Their analysis recovered
all of these but Europasaurus in an unresolved polytomym with
Europasaurus one node down the tree and Somphospondyli one node up.
This constitutes the first numerical evidence for a speciose clade
Brachiosauridae.  Hurrah!

(The other putative brachiosauru, Qiaowanlong, comes out as the sister
to Erketu, in a small clade near the base of Somphospondyli.)