Upper molar morphology, homologies and evolutionary patterns of chinchilloid rodents (Mammalia, Caviomorpha)

RASIA, L., CANDELA, A.

JOURNAL OF ANATOMY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2018

0021-8782

Chinchilloidea are a clade of caviomorph rodents that includes seven living species, the Dinomyidae Dinomysbranickii, the Chinchillidae Lagostomus maximus, two species of Chinchilla and three species of Lagidium. Inaddition, two extinct families are traditionally considered chinchilloids ? Neoepiblemidae and Cephalomyidae.The phylogeny of the Chinchilloidea has so far not been well established and is based on partial analyses.Studying the anatomy and ontogeny of extinct and extant taxa, we propose homologies for the upper molars ofChinchilloidea for which these homologies have not been previously proposed: that is the ChinchillidaeProlagostomus, Lagostomus, Lagidium and Chinchilla, and the Neoepiblemidae Neoepiblema and Phoberomys.We identify patterns of occlusal simplification within Chinchilloidea and evaluate its importance in anevolutionary context. A phylogenetic analysis recovered Dinomyidae, Chinchillidae and Neoepiblemidae as clades.?Cephalomyidae? have not been not recovered as a monophyletic group and ?cephalomyids? are closely related toNeoepiblemidae. Branisamys is not included within the Dinomyidae and appears to be a basal chinchilloid.Key words: dental anatomy; ontogeny; phylogeny; Rodentia.