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Scanning Electron Microscopical Study of the Eggshell of Three Species of Sergentomyia (Diptera:Psychodidae)

  • A. M. Fausto
  • M. Mazzini
  • M. Maroli
  • M. J. Mutinga
Research Article

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.

Key Words

Phlebotominae eggshell chorion ultrastructure ootaxonomy scanning electron microscopy transmission electron microscopy 

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 basai 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 étudiées a été comparée avec celle d’autres Phlebotominae, et sa utilisation comme caractère taxinomique a été analysée.

Mots Clés

Phlebotominae revetement chorionique des oeufs ultrastructure du chorion ootaxinomie microscope électronique à balayage microscope électronique à transmission 

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Copyright information

© ICIPE 1993

Authors and Affiliations

  • A. M. Fausto
    • 1
  • M. Mazzini
    • 1
  • M. Maroli
    • 2
  • M. J. Mutinga
    • 3
  1. 1.Department of Environmental SciencesUniversity of TusciaViterboItaly
  2. 2.Department of ParasitologyIstituto Superiore di SanitáRomeItaly
  3. 3.The International Centre of Insect Physiology and Ecology (ICIPE)NairobiKenya

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