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A new species of Dicerorhinus (Rhinocerotidae) from the Plio-Pleistocene of Myanmar

ZIN-MAUNG-MAUNG-THEIN, MASANARU TAKAI, TAKEHISA TSUBAMOTO, THAUNG-HTIKE, NAOKO EGI and MAUNG-MAUNG

A skull and mandible of the new species of Dicerorhinus gwebinensis sp. nov. of Rhinocerotidae (Mammalia, Perissodactyla) is described. The material is collected from the upper part of the Irrawaddy sediments (Plio-Pleistocene) in central Myanmar. D. gwebinensis sp. nov. is morphologically more similar to the extant species D. sumatrensis (Sumatran rhinoceros) than other species of this genus but differs from D. sumatrensis in having the comparatively shorter nasal, the more concave dorsal profile of the skull, the more elevated occiput and presence of molar crista in M3/. This is the first discovery of Dicerorhinus in the upper Miocene to lower Pleistocene of the Indian subcontinent and Mainland Southeast Asia, and fills the chronological and geographical gap of this lineage in Asia. The Dicerorhinus clade probably migrated into Southeast Asia from East Asia by the Pliocene or early Pleistocene. This hypothesis is supported by the scarcity or absence of this clade in the Neogene mammalian fauna of the Indian Subcontinent.

PALAEONTOLOGY, Vol. 51, Part 6, 2008, pp. 1419-1433

NOV/05/2008

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