Key to the species of Anenterotrema

1. Anterior end with transverse fold of body wall; metraterm strongly muscular....................................... 2

1’. Anterior end without transverse fold of body wall; metraterm thin-walled or indistinguishable........................ 3

2. Testes large in relation to body size, Bl/Tl: 3–6. In Phyllostomidae and Natalidae from Mexico and Colombia .... A. auritum

2’. Testes small to mediun in relation to body size, Bl/Tl: 7–15. In Molossidae, Phyllostomidae, Vespertilionidae, Mormoopidae and Emballonuridae from Brazil, Colombia, Costa Rica and Cuba ............................... A. eduardocaballeroi

3. Ovary close to posterior end of body; vitellarium between ventral sucker and ovary. In Phyllostomidae from Panama .................................................................................................. A. stunkardi

3’. Ovary in testicular or post-testicular region; vitellarium posterior to gonads........................................ 4

4. Suckers with spherical aperture. In Molossidae and Phyllostomidae from Brazil and Argentina ............. A. liliputianum

4’. Suckers with aperture reduced to longitudinal slit. In Phyllostomidae from Ecuador ....................... A. mesolecitha