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Memórias do Instituto Oswaldo Cruz

versión impresa ISSN 0074-0276versión On-line ISSN 1678-8060

Mem. Inst. Oswaldo Cruz v.87 n.2 Rio de Janeiro abr./jun. 1992

http://dx.doi.org/10.1590/S0074-02761992000200014 

Sexual distinction between 5th instar nymphs of six species of Triatominae (Hemiptera, Reduviidae)

João Aristeu da Rosa1 

José Maria Soares Barata2 

Nilso Barelli3 

Jair Licio Ferreira Santos4 

Francisco Miguel Belda Neto1 

UNESP, Faculdade de Ciências Farmacêuticas, Araraquara, Brasil

USP, Faculdade de Saúde pública, São Paulo, Brasil

UNESP, Instituto de Química, Araraquara, Brasil

USP, Faculdade de Saúde Pública, São Paulo, Brasil

ABSTRACT

The aim of this paper is to present the analysis of sexual morphological differences observed in 5th instar nymphs of the following species: Panstrongylus megistus; Rhodnius neglectus; Triatoma brasiliensis; T. infestans; T. matogrosensis and T. tibiamaculata. Male and female nymphs were examined and photographed with a Scanning Electron Microscope. The 9th segment dimensions of dorsal and ventral faces were determined through a Profile Projector. Results and statistical analysis showed significant differences: the 9th sternite is significantly broader in male than female nymphs, while in five species; tergites in female nymphs are broad and in male are narrow.

Key words: sexual distinction; scanning; nymphs; Triatominae

 

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