Actualités des dinosaures
| Posté le : 25/11/2009 à 09:07 (Lu 4445 fois)|
A new large-bodied theropod dinosaur from the Middle Jurassic of Warwickshire, United Kingdom
Roger B. J. Benson and Jonathan D. Radley
Acta Palaeontologica Polonica in press
available online 20 Nov 2009
Previously undocumented postcranial material from the Chipping Norton Limestone Formation (Middle Jurassic: Lower Bathonian) of Cross Hands Quarry, near Little Compton, Warwickshire represents a new large-bodied theropod dinosaur, distinct from the contemporaneous Megalosaurus bucklandii. Cruxicheiros newmanorum gen. et sp. nov. is diagnosed by a single autapomorphy, the presence of a proximomedially inclined ridge within the groove that marks the lateral extent of the posterior flange of the femoral caput (trochanteric fossa). C. newmanorum shows three tetanuran features: widely separated cervical zygapophyses, a swollen ridge on the lateral surface of the iliac blade and an anterior spur of the caudal neural spines. However, due to fragmentary preservation its affinities within Tetanurae remain uncertain: phylogenetic analysis places it as the most basal tetanuran, the most basal megalosauroid (= spinosauroid) or the most basal neotetanuran.
|Re: Cruxicheiros newmanorum |