Anatomical and functional data on female and male reproductive systems of some dung beetle species of Aphodiinae and Eupariinae of Mexico (Coleoptera: Scarabaeoidea : Aphodiidae)

Female and male reproductive systems of two species of Aphodiinae, Aphodius opisthius and Cephalocyclus hogei, as well as of one species of Eupriinae, Ataenius apicalis are described. Comparisons are then made between 11 spec ies of both subfamilies. The reproductive systems of both sexes of Aphodiin ae and Eupariinae are similar, but there are differences between species of the two Aphodiinae genera and between the two subfamilies. In females, ova rioles number in each ovary varies among species. The genital chamber of Ap hodius and Ataenius is similar, but seems different in Cephalocyclus. The s permathecae are variable according to species. The spermathecal duct and sp ermathecal glandular duct originates in the same place in Aphodius, but not in Ataenius and Cephalocyclus. Males of Aphodius have a, Cephalocyclus hav e 6, and Ataenius have 2 testicular follicles. The seminal vesicle only is present in Cephalocyclus. The glandular reservoirs are similar in Aphodius and Cephalocyclus, but differentet in Ataenius. The anterior part of ejacul atory duct and the internal sac differ among species of the two subfamilies . The preputial ventral gland only is present in Aphodius and Cephalocyclus .