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Anais da Academia Brasileira de Ciências

Print version ISSN 0001-3765On-line version ISSN 1678-2690

Abstract

MOTHE, DIMILA et al. A new Mammutidae (Proboscidea, Mammalia) from the Late Miocene of Gansu Province, China. An. Acad. Bras. Ciênc. [online]. 2016, vol.88, n.1, pp.65-74.  Epub Feb 02, 2016. ISSN 0001-3765.  http://dx.doi.org/10.1590/0001-3765201520150261.

The "Yanghecun specimen", a proboscidean specimen represented by a mandible from Miocene of China and previously described as Gomphotheriidae, is here reviewed and described as a new genus and species of Mammutidae: Sinomammut tobieni. This taxon is a longirostrine mastodon, lacking lower tusks, and bearing a wide last molar with oblique and non-inflated lophids, broad transverse interlophids, and yoke-like wear figures. Phylogenetic analysis of Mammutidae based on dental and mandibular features recovered S. tobieni as sister group of the mastodon Mammut. The longirostrine condition and the well-developed lower incisors seem to be primitive for Mammutidae, while the brevirostry is the derived condition, probably emerged during the middle Miocene (12-11 Mya). However, two derived conditions are recognized to the lower tusks: the absence of lower tusks (S. tobieni) and the occasional presence of vestigial lower tusks (Mammut).

Keywords : Evolution; Longirostrine symphysis; Mammutidae; Miocene; Proboscidea.

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