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José Serrão, Teresa Gonçalves, Ana Lúcia Souza, Jane Costa, Simone Freitas and Jacenir Santos-Mallet

Abstract

In order to determine the existence of differentiation in the lengths of the testis follicles between three species and one subspecies of Triatoma a detailed morphometric analysis was carried out. Captures were performed at different sites where the species were described: Caicó, state of Rio Grande do Norte (T. brasiliensis), Petrolina, state of Pernambuco (T. brasiliensis macromelasoma), Juazeiro, state of Bahia (T. juazeirensis) and Espinosa, state of Minas Gerais (T. melanica). The records of the lengths of the testis follicles were submitted to statistic analysis. Results showed that all Triatoma studied have seven follicles in the testis, following the Triatominae pattern, which present different lengths. The morphometric data indicate the separation of the species in three groups: T. brasiliensis, T. melanica, and T. juazeirensis+T. brasiliensis macromelasoma. The obtained results are in agreement with other previous morphologic, ecologic, genetic, molecular, and phylogeographic studies, corroborating the importance of the morphometry on the testis follicles for taxonomic studies of triatomines.

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Teresa Cristina Monte Gonçalves, Simone Patrícia Carneiro Freitas, Jacenir Reis Dos Santos-Mallet, José Eduardo Serrão and Elias Seixas Lorosa

Abstract

The male reproductive tract in Triatominae has a pair of testes, two vasa deferentia, a pair of seminal vesicles, four pairs of accessory glands, and an ejaculatory duct, which opens in the aedeagus. In species of the genus Triatoma each testis is formed by seven testicular follicles. Because Triatoma rubrofasciata has a common ancestor with species of Triatoma occurring in North America and because the length of testis follicles varies among different species of Triatoma a morphometrical analysis of the follicles was conducted. Triatoma rubrofasciata has seven testis follicles of variable length that are similar between left and right testes. The statistics allowed the classification in a long follicle, two medium follicles, two that are short, and two that are very short. This finding is compared with data available for other Triatominae and it is emphasized that the length of follicles testis should be included in future phylogenetic analysis of Triatominae.