Comparative morphological analysis of testis follicles in dung beetles (Coleoptera: Scarabaeidae: Scarabaeinae, Aphodiinae, Geotrupinae)

We examined the reproductive systems, including genitalia, of 10 species of Geotrupini from Mexico. Females of all examined species have six ovarioles in each ovary. Spermathecae and genitália of all species are similar. The genital plates show marked morphological differences at the species level, and thus may be useful as specific characters in taxonomic studies. Males of all of the examined species have six follicles per testicle. The aedeagus is variable across species and is used to distinguish species.