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Range DescriptionCurrently known from the Anjiamangirana region in northwestern Madagascar. Louis et al. (2006) gave the range as south of the Mahajamba River and north of the Maevarano and Sofia River, which is presumably a lapsis for "north of the Mahajamba River and south of the Maevarano and Sofia River". Formerly, the sportive lemurs found in this part of Madagascar were thought to be L. edwardsi. More recently, Craul et al. (2007) have described L. otto from between the Mahajamba and the Sofia, making the Sofia River effectively the southerly limit of L. grewcockorum; Craul et al. (2007) also described the species L. manasamody from between the Sofia and Maeverano Rivers, but following Zinner et al. (2007) that species is here considered a synonym of L. grewcockorum. Clearly, the limits between L. edwardsi, L. otto, and L. sahamalazensis remain unclear. The extent of occurrence (EOO) is estimated to be less than 2,180 km2.