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THE AFRICAN NANNOMYS (MURIDAE): AN EARLY OFFSHOOT FROM THE MUS LINEAGE—EVIDENCE FROM scnDNA HYBRIDIZATION EXPERIMENTS AND COMPARED MORPHOLOGY

In: Israel Journal of Ecology and Evolution
Authors:
CATZEFLIS FRANÇOIS M. Institut des Sciences del' Evolution

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CHRISTIANE DENYS Institut des Sciences del' Evolution

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The systematics of the African pigmy mice Nannomys is studied through molecular and morphological approaches. Molecular data based on single-copy nuclear DNA (scnDNA) hybridization indicate that Nannomys is as divergent from Mus sensu stricto as is the Asian subgenus Coelomys; moreover, it shows a much closer relationship to Mus than to any other African, Oriental, or Palearctic murid genus tested so far. Furthermore, when using a molecular clock calibrated by Mus/Rattus split, estimated by paleontologists at about 10 million years ago, it appears that the separation between Nannomys and the Mus lineage occurred about 5 million years ago, a date which could indicate the earliest entry of the ancestors of Nannomys in Africa. Morphological investigations indicate that it is almost impossible to distinguish between Nannomys sp. and some similar Asian Mus species. These results suggest that Nannomys and their Oriental relatives have a common ancestor either in Africa or in Asia, or else have developed a parallel evolution, as seen in many other rodent groups.

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