Resumen de Cathartesaura anaerobica gen. et sp. nov., a new rebbachisaurid (Dinosauria, Sauropoda) from the Huincul Formation (Upper Cretaceous), Río Negro, Argentina
Pablo A. Gallina, Sebastián Apesteguía
A new mid-sized sauropod from ‘La Buitrera’, Huincul Formation (Turonian-Coniacian), Río NegroProvince, Cathartesaura anaerobica gen. et sp. nov. is described. It is known from an incomplete, but associatedskeleton that includes diagnostic postcranial elements such as a posterior cervical, an anterior caudal, and amid caudal vertebra, a left scapula, a left ilium and a right femur. Cathartesaura anaerobica gen. et sp. nov.exhibits several autapomorphies, such as a posterior cervical vertebra with an accessory lamina that arises fromthe mid length of the prezygodiapophysial lamina and reaches the centrum, a thin, wing-like transverse processeson the anterior caudal vertebrae mostly supported by a ventral bony bar that frames a deep triangularfossa, and each anterior caudal neural spine with the lateral laminae composed of the spinoprezygapophyseallamina, the lateral spinopostzygapophyseal lamina and the spinodiapophyseal lamina. The new taxon is relatedto Rebbachisaurus and Limaysaurus because of the presence of several synapomorphies, which support itsinclusion in a separate clade of basal Diplodocoidea, the Rebbachisauridae. Aspects of rebbachisaurid vertebralanatomy including musculature and pneumaticity are briefly commented upon. A cladistic analysis is presentedin an attempt to partially resolve basal diplodocoid phylogenetic relationships.
