Scanning electron microscopical study of the eggshell of three species of Sergentomyia (Diptera: Psychodidae)
1993
Fausto, A.M. | Mazzini, M. | Maroli, M. | Mutinga, M.J.
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.
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