Intraspecific chromosome variability in a lemur from the north of Madagascar: <i>Lepilemur septentrionalis</i>, species nova

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<jats:title>Abstract</jats:title><jats:p>A cytogenetical study of 25 <jats:italic>Lepilemur</jats:italic> from the north of Madagascar has given evidence for six karyotypes (with four diploid numbers). Four of the karyotypes with these diploid numbers — 2N = 38, 2N = 36, 2N = 34 — we believe evolved from one another by centric fusion; and two karyotypes resulted from the hybridization of two of these (2N = 37 and 2N = 35). The different karyotypes distinguish themselves clearly from those of other species of <jats:italic>Lepilemur.</jats:italic> We have named a new species, <jats:italic>Lepilemur septentrionalis</jats:italic> (sp. nov.) with four subspecies: <jats:italic>L. s. andrafiamenensis</jats:italic> (2N = 38), <jats:italic>L. s. ankaranensis</jats:italic> (2N = 36), <jats:italic>L. s. sahafarensis</jats:italic> (2N = 36), and <jats:italic>L. s. septentrionalis</jats:italic> (2N = 34).</jats:p>

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