Shuangmiaosaurus

["bh480@scn.org" <bh480@scn.org>]

From: Ben Creisler bh480@scn.org

In case this new taxon has not been mentioned here:

You H.L., Ji Q., Li J.L. & Li Y.X., 2003. A new hadrosauroid dinosaur from
the mid-Cretaceous of Liaoning, China.
ACTA GEOLOGICA SINICA  (ENGLISH EDITION): 77 (2) : 148-154 (JUN 2003)
A new hadrosauroid dinosaur, Shuangmiaosaurus gilmorei gen. et sp. nov., is
described based on a complete left maxilla with articulated premaxilla and
lacrimal fragments, and a complete left dentary from the mid-Cretaceous
Sunjiawan Formation of Beipiao, Liaoning, northeastern China. Cladistic
analysis shows that Shuangmiaosaurus is a basal hadrosauroid, and comprises
the sister taxon to Hadrosauridae. In both Shuangmiaosaurus and
Hadrosauridae, the maxilla-jugal suture is butt-jointed, rather than
finger-in-recess articulation as in other basal hadrosauroids. However,
Shuangmiaosaurus does not possess such hadrosaurid synapomorphies as the
diamond-shaped maxillary crowns with reduced primary ridges and reduced
marginal denticles.



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