info:eu-repo/semantics/article
Skull anatomy and neuromorphology of Hypsosteiromys , a Colhuehuapian erethizontid rodent from Argentina
Fecha
2004-03Registro en:
Dozo, Maria Teresa; Vucetich, María Guiomar; Candela, Adriana Magdalena; Skull anatomy and neuromorphology of Hypsosteiromys , a Colhuehuapian erethizontid rodent from Argentina; Society of Vertebrate Paleontology; Journal of Vertebrate Paleontology; 24; 1; 3-2004; 228-234
0272-4634
1937-2809
CONICET Digital
CONICET
Autor
Dozo, Maria Teresa
Vucetich, María Guiomar
Candela, Adriana Magdalena
Resumen
A relatively complete skull of Hypsosteiromys with a well-preserved natural endocranial cast was recovered from the Colhuehuapi Member (lower Miocene, Sarmiento Formation) at Gran Barranca, Chubut Province, Argentina. This is the only known skull of this genus. It differs from the other erethizontids because it is all along very low, the ascending ramus of the premaxillae extends behind the posterior margins of the nasals, and the external auditive meatus has a ventral furrow. Comparison of the endocast with the brains of extant Erethizontidae demonstrates remarkable neuro-morphological homogeneity, despite differences in size. Erethizontid´s brains have rounded telencephalic hemispheres with prominent frontal lobes and small olfactory bulbs, and lack temporal lobes and neocortical sulci. Thus, the Gran Barranca skull shows that the external neuromorphology of the Erethizontidae has not changed substantially at least since the early Miocene.