Phylogeny of western Palaearctic vespertilionid bats. Neighbor-joining (NJ) tree based on Kimura 2-parameter distances between mitochondrial nd1 sequences from 216 vespertilionid bats of the Western Palaearctic region. Thick branches lead to the different species while thin branches indicate intraspecific distances. Species names are encircled for species that were recently discovered with the help of DNA sequencing. Names of taxa for which a status as separate species is first proposed herein are highlighted by a black rectangle. Tadarida teniotis of the family Molossidae was used as an outgroup. Bootstrap support values of at least 70 are given above branches (5000 bootstrap replicates).