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Scanning electron microscopical study of the eggshell of three species of Sergentomyia (Diptera: Psychodidae)

Published online by Cambridge University Press:  19 September 2011

A. M. Fausto
Affiliation:
University of Tuscia, Department of Environmental Sciences, 01100 Viterbo, Italy
M. Mazzini
Affiliation:
University of Tuscia, Department of Environmental Sciences, 01100 Viterbo, Italy
M. Maroli
Affiliation:
Istituto Superiore di Sanitá, Department of Parasitology, 00161 Rome, Italy
M. J. Mutinga
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30772, Nairobi, Kenya

Abstract

The eggshells of Sergentomyia minuta, S. schwetzi and S. ingrami are studied by scanning (SEM) and transmission (TEM) electron microscopy. In all three species the surface sculpturing is characterized by a polygonal pattern due to intersecting ridges. Each ridge is formed by columns arranged in palisade and resting on a reticular basal layer. TEM shows that the columns represent the outer chorion and the basal layer the intermediated one. Under these layers an inner chorion and a vitelline envelope are present. The eggshell structures of the three species are compared with those of other Phlebotominae and their taxonomic value is discussed.

Résumé

Les revetements chorioniques des oeufs de Sergentomyia minuta, S. schwetzi et S. ingrami ont été etudiés au microscope électronique à balayage (SEM) et à transmission (TEM). La microsculpture de la surface montre chez les trois espèces une structure polygonale formée par intersection de cretes en relief. Chaque crete est formée d'une serie trabéculaire de piliers, placés sur un couche basal réticulaire. Les observations au TEM montrent que les piliers sont le chorion superficiel et que le couche basal est le chorion intermédiaire; entre les deux sont placés un chorion interne et une enveloppe vitelline. La structure externe des oefs des trois espèces etudiées a été comparée avec celle d'autres Phlebotominae, et sa utilisation comme caractère taxinomique a été analysée.

Type
Research Articles
Copyright
Copyright © ICIPE 1993

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