Abstract
G-band patterns are described for the karyotypes of both genera and all subgenera of mormoopid bats. A nomenclatural system is proposed for the mormoopid genome in which each autosomal arm is numbered and all bands on each arm are numbered from the centromere to the telomere. G-band patterns indicate that the karyotypes have remained stable throughout the evolution of the family; both species of Mormoops appear to differ from Pteronotus only by the presence in the former of a prominent G-positive region proximal to the centromere of arm 2. Mormoops blainvilli also possessed a prominent G-positive band in the distal end of arm 9 that stained lightly in all other species. C-band patterns of Mormoops megalophylla showed that most heterochromatic regions were centromeric, and silver-nitrate staining in this species and two species of Pteronotus showed that all possessed three pairs of nucleolar organizer regions on the centromeric ends of acrocentric chromosomes. G-band patterns suggest that the karyotype of all Pteronotus is primitive for the family.
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