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Myotis ciliolabrum has recently been recognised as a species distinct from Myotis leibii. Electrophoretic divergence between the two species exceeds that of subspecies of other bats and is similar to that found between other species. Fixed allelic differences at two loci suggested that no introgression occurs. The electrophoretic data support the conclusion that M. ciliolabrum and M. leibii are distinct species.
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R. M. Herd (1987) studied this question.
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