RESUMO
Searching for morphometric differences between sexes in immature forms, the development of genital plates in the exuviae of Triatoma pallidipennis StÖl 1872nymphs was studied. Differences were found in the form and size of the 9th genital urosternite, it is larger and wider in males as compared to females. This difference is reported in several South American Triatoma species. From our results it is possible to sex early stages from microscopic observation of genital plates in whole insects
Assuntos
Animais , Masculino , Feminino , Genitália , Caracteres Sexuais , Análise para Determinação do Sexo , Triatoma , Análise de Variância , Genitália , Ninfa , TriatomaRESUMO
Six hundred and eleven random-source dogs (338 male, 273 female) one year of age or older, from six sections of the city of Recife, Pernambuco, were examined antemortem for circulating microfilariae Dirofilaria immitis and Dipetalonema reconditum adult heartworm (D. immitis) antigen, and examined postmortem for adult heartworms. The prevalence of heartworm infection was 2.3 per cent (14/611), as determined by necropsy for adult worms, and 1 per cent (6/611) had circulating microfilariae of D. immitis; thus, 57.1 per cent of the heartworm-infected dogs had occult infections. The results of serological testing indicated that 1.3 per cent (8/611) of the dogs were positive for adult heartworm antigen. A total of 42 (6.9 per cent) of the dogs had microfilariae of D. reconditum; 40 of these had only D. reconditum and two additional dogs had microfilariae of both species, D. immitis and D. reconditum.