Cytotypes and Morphometrics of Two Phyllostomatid Bats, \u3ci\u3eMicronycteris hirsuta\u3c/i\u3e and \u3ci\u3eVampyressa pusilla\u3c/i\u3e

Jackson and Patton stated that the key to understanding mechanisms of chromosomal evolution lies in studies of chromosomal variation within populations that can hybridize. Hybrids between cytotypes contain the answer to problems of meiotic pairing and reduced fertility, as well as information concerning the nature of zones of contact. However, before detailed studies can be initiated, chromosomal races and hybrid zones must be located. Few chromosomal races have been described for bats. Within the family Vespertilionidae, five species are known to have such races and races have been reported in two species of the family Phyllostomatidae. Described are chromosomal races of two additional species of phyllostomatids (Vampyressa pusilla and Micronycteris hirsuta) and discuss morphological variation associated with these races