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Small-sized abelisaurid from the Upper Cretaceous of Argentina
A new paper.
Juan I. Canale, Ignacio Cerda, Fernando E. Novas & Alejandro Haluza (2016)
Small-sized abelisaurid (Theropoda: Ceratosauria) remains from the
Upper Cretaceous of northwest Patagonia, Argentina.
Cretaceous Research 62: 18–28
http: // www.sciencedirect.com/science/article/pii/S0195667116300143
A new abelisaurid theropod specimen is presented and described.
It is one of the smallest abelisaurids ever recorded.
A histological analysis of this specimen, the first for an abelisaurid
theropod, is offered.
The phylogenetic analysis showed a basal position inside Abelisauridae
for this taxon.
It finding adds a new form to the diverse meat-eating dinosaur fauna
of Candeleros Formation.
A new abelisaurid theropod from the Cenomanian of Candeleros Formation
(Neuquén Province, NW Patagonia, Argentina) is described. It includes
an isolated frontal, partial pelvis, two fused sacral centra, femoral
shaft, rib fragments, partial metatarsal II and shaft of metatarsal
III. A paleohistological analysis shows that MMCh-PV 69 was
somatically mature at time of death. The prevalence of relatively
ordered intrinsic fibers in the primary bone indicates a relatively
lower growth rate of MMCh-PV 69 compared with other abelisauroids,
such as Aucasaurus garridoi. Phylogenetic analysis found MMCh-PV 69 as
a basal abelisaurid, sister group of the node formed by
Majungasaurinae and Brachyrostra. We estimated the body mass of
MMCh-PV 69 in 240 kg, which makes it one of the smallest abelisaurids
recorded. This new form adds to the extensive theropod fauna of the
Candeleros Formation, probably the most diverse association of
meat-eating dinosaurs recorded in a Cretaceous Formation from South