Karyotypic Analysis of Plecotus mexicanus (Chiroptera: Vespertilionidae)

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In this paper the karyotype of Plecotus mexicanus, a Mexican endemic species, is described and compared with those of the other species of the genus. It was found that P. mexicanus shares several features with P. townsendii and P. rafinsesqui such as diploid number 2n=32, a fundamental number of 52, acrocentric sex chromosomes and the submetacentric chromosome pair 10; the last is a new distinctive character between the American and European forms of the genus Plecotus.