01272nas a2200133   4500008004100000245012300041210006900164300001000233490000700243520070000250100002500950700002500975856013801000       2005                        eng d00aStructure of the terminal ampulla in male larvae of Canthon cyanellus LeConte (Coleoptera: Scarabaeidae: Scarabaeinae)0 aStructure of the terminal ampulla in male larvae of Canthon cyan  a35-390 v593 aThe larvae of Canthon cyanellus LeConte show well-defined sexual dimorphism. This dimorphism is seen in the presence of a terminal ampulla in the ventral region of the ninth abdominal segment in males. The terminal ampulla is a cuticular structure apparently present only in the male larvae beginning at the first instar and shows morphological changes during subsequent larval instars. A detailed study of terminal ampulla morphogenesis is needed to understand exactly how the ampulla develops into the structures of the ejaculatory bulb and aedeagus in the imago. Terminal ampullae have also observed in third-instar larvae of some species of Scarabaeidae, Trogidae, Passalidae and Lucanidae. 1 aM., Imelda, Martinez1 aLumaret, Jean-Pierre  uhttps://scarabnet.myspecies.info/structure-terminal-ampulla-male-larvae-canthon-cyanellus-leconte-coleoptera-scarabaeidae-scarabaeina