Implementing a phylogenetic analysis of mitochondrial DNA (mtDNA) sequence data (ca. 2000 bp), the molecular variation of northwestern mouse lemurs (Microcebus species) was compared, providing support for the formal description of a new species from Nosy Be, Madagascar. Additionally, there is initial support for a proposed new species from Antafondro Classified Forest. Phylogenetic inference and tree topology of the variation observed in mitochondrial DNA sequence data was generated from 42 individuals. This represents the 12 currently recognized species of Microcebus and clearly distinguishes the current taxonomy as well as a newly described species and a newly proposed species. The localities of the newly identified species are from witih the original distribution of Microcebus sambiranensis. A formal description established from molecular genetic and morphologic variation is presented for the newly named species from Nosy Be Island.
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