01481nas a2200181   4500008004100000245006200041210006000103260000800163300001000171490000600181520091700187653001101104653001801115653002301133100002501156700002501181856009301206       2003                        eng d00aDimorfismo sexual en larvas de Scarabaeoidea (Coleoptera)0 aDimorfismo sexual en larvas de Scarabaeoidea Coleoptera  csep  a15-180 v33 aA well defined sexual dimorphism is present in scarabaeoid larvae. Dimorphism was observed in late-age larvae of some species of Scarabaeidae, Aphodiidae, Trogidae, Orphinidae, Dynastidae, Passalidae and Lucanidae. This dimorphism manifests itself in the presence of a terminal ampulla, a cuticular structure situated in the ventral region of the 9th abdominal segment which is only present in male specimens. In Scarabaeidae, sexual dimorphism was only observed in the pupae of six species. The terminal ampulla in Canthon cyanellus cyanellus LeConte (Scarabaeidae) is present in the male larvae apparently since the first instar, and changes morphologically during the next larva instars. Only a detailed study of the morphogenesis of the terminal ampulla during the larval and pupal stages could help to define exactly what structures of the ejaculatory bulb and aedeagus it will turn into in the adult stage.10alarvae10aScarabaeoidea10asexual dimorphism.1 aM., Imelda, Martinez1 aLumaret, Jean-Pierre  uhttps://scarabnet.myspecies.info/dimorfismo-sexual-en-larvas-de-scarabaeoidea-coleoptera01272nas 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-scarabaeina02052nas a2200265   4500008004100000245009700041210006900138260000800207300001200215490000800227520131200235653000601547653000801553653001401561653001401575653002401589653001701613653001401630653001601644653001701660100002501677700002501702700002401727856003501751       2001                        eng d00aSuspected side effects of a herbicide on dung beetle populations (Coleoptera : Scarabaeidae)0 aSuspected side effects of a herbicide on dung beetle populations  cNov  a989-9940 v3243 aThis paper addresses the association between use of a herbicide and anecdotal reports of reduced dung degradation and dung beetle populations. Dung beetles were monthly collected at two adjacent ranches in Mexico. Ranches were similar in area, elevation, exposition, soil, and vegetation, but differed in weed control. Ranch A controlled weeds manually, and ranch B controlled unwanted vegetation with applications of the herbicide Tordon(R)101M. The main species recovered on each ranch (Ataenius apicalis) was significantly more abundant at ranch A than at ranch B. Conversely, similar numbers of a second species, Ataenius sculptor, were recovered from both ranches. Three lines of evidence support the tentative conclusion that herbicide applications may be causing a decline in populations of A. apicalis on ranch B. First, the greatest reductions of A. apicalis were observed during periods of herbicide application. Second, A. sculptor, apparently little affected by these same herbicide applications, is active primarily during months without herbicide applications. Third, preliminary results of laboratory studies show that exposure to herbicide can impair reproductive function of the dung beetle Canthon cyanellus. (C) 2001 Academie des Sciences/Editions scientifiques et medicales Elsevier SAS.10a210a4-D10aherbicide10aMortality10aneotropical pasture10aScarabaeidae10asterility10aTordon((R))10aweed control1 aM., Imelda, Martinez1 aLumaret, Jean-Pierre1 aR., Magdalena, Cruz  u<Go to ISI>://000172159700003 