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A POSSIBLE MAMMALIAN ANCESTOR FROM THE MIDDLE TRIASSIC OF BRAZIL (THERAPSIDA-CYNODONTIA)

1975; Cambridge University Press; Volume: 49; Issue: 5 Linguagem: Inglês

1937-2337

José F. Bonaparte, Mário Costa Barberena,

Physiological and biochemical adaptations

briefly described and discussed. The lack of postorbital bars, prefrontals and postorbitals, the presence of wide frontals, weak temporal arches, a low and restricted parietal crest, and postcanines with four cusps in line provided, at least in the uppers, with an incipient bifurcation of the roots, indicate a level of organization suitable for ancestry to the Mammalia. It bears neither a dentary-squamosal joint nor a cingulum in the known postcanines.