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Re: Gilmoreosaurus redescribed


--- On Wed, 8/25/10, Brad McFeeters <archosauromorph2@hotmail.com> wrote:

> From: Brad McFeeters <archosauromorph2@hotmail.com>
> Subject: Gilmoreosaurus redescribed
> To: dinosaur@usc.edu
> Date: Wednesday, August 25, 2010, 11:24 AM
> Prieto-Márquez, A. & M.A. Norell, 2010.  Anatomy and
> Relationships of _Gilmoreosaurus mongoliensis_ (Dinosauria:
> Hadrosauroidea) from the Late Cretaceous of Central Asia.
>  American Museum Novitates 3694: 1-49.
> Abstract: The osteology of the hadrosauroid dinosaur
> _Gilmoreosaurus mongoliensis_ is redescribed in detail based
> on the disarticulated cranial and postcranial elements of at
> least four individuals. These together constitute the
> lectotype and hypodigm of this species. The diagnosis is
> emended to include two autapomorphies (paddle-shaped
> postacetabular process that is less than 70% of the length
> of the iliac central plate and manual phalanx III-1 with
> greatly asymmetrical distal surface) and the unique
> combination of two iliac characters (presence of ischial
> tuberosity and supraacetabular process with apex located
> posterodorsal to ischial peduncle). The distinction of _G.
> mongoliensis_ from _B. johnsoni_ is confirmed on the basis
> of characters of the maxilla, dentition, ilium, ischium, and
> pubis. Maximum parsimony analysis places _G. mongoliensis_
> as a closely related outgroup to the Hadrosauridae, the
> sister taxon to the clade composed of all hadrosauroids
> closer to _Telmatosaurus transsylvanicus_ than to
> _Bactrosaurus johnsoni_.