Estudo das fóveas dorsais de ninfas e adultos de quatro espécies de carrapatos (Acari: Ixodidae) por microscopia eletrônica de varredura
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Data
2006
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Resumo
The foveae dorsalis, the external opening of the sex pheromone 2,6-dichlorophenol producer gland, of Amblyomma
cajennense, Dermacentor nitens, Rhipicephalus (Boophilus) microplus and Rhipicephalus sanguineus was studied
with scanning electron microscopy. At least three specimens from each stage: unfed larvae, nymphs, females and
males, and females fed for 4 to 6 days were examined. The foveae dorsales were not observed in larvae and R. (B.)
microplus males. The foveae dorsales were observed as paired depressions, below the scutum in nymphs and
females. In males they appeared as paired subtle elevations, located 2/3 of the way along the idiosoma. Generally the
larger structures with a higher number of pores were observed in A. cajennense. Males and nymphs showed foveae
dorsales of similar sizes but smaller than those of females. After feeding, secretions were observed in D. nitens and
A. cajennense foveae dorsalis. In R. sanguineus and R. (B.) microplus this kind of secretion was not observed. An
attempt to connect the appearance of foveae dorsalis with the role of 2,6-dichlorophenol in tick copula has been
made. The occurrence of D. nitens females with three foveae dorsales was described.
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Amblyomma cajennense, Dermacentor nitens, Rhipicephalus (Boophilus) microplus, Rhipicephalus sanguineus, Fóvea dorsal, Foveae dorsalis
Citação
BORGES, Lígia M. F.; RIBEIRO, Múcio F. B.; BICALHO, Kelly A.; FERREIRA, Fabiene. Estudo das fóveas dorsais de ninfas e adultos de quatro espécies de carrapatos (Acari: Ixodidae) por microscopia eletrônica de varredura. Revista Brasileira de Parasitologia Veterinária, Jaboticabal, v. 15, n. 3, p. 89-96, 2006.