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Eggshell Fine Structure of Amata passalis F. (Lepidoptera: Amatidae), A Pest of Mulberry

Published online by Cambridge University Press:  19 September 2011

Vineet Kumar ,
S. Rajadurai ,
A. M. Babu  and
B. K. Kariappa
Vineet Kumar
Affiliation:
Electron Microscopy Unit, Central Sericultural Research and Training Institute, Mysore-570 008, India
S. Rajadurai
Affiliation:
Electron Microscopy Unit, Central Sericultural Research and Training Institute, Mysore-570 008, India
A. M. Babu
Affiliation:
Electron Microscopy Unit, Central Sericultural Research and Training Institute, Mysore-570 008, India
B. K. Kariappa
Affiliation:
Electron Microscopy Unit, Central Sericultural Research and Training Institute, Mysore-570 008, India
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Abstract

The eggshell fine structure of a lepidopteran pest of mulberry, Amata passalis F. (Lepidoptera: Amatidae), was investigated using scanning electron microscopy. The micropylar rosette around the micropyle, shell imprints, aeropyles and regional differentiation were studied. The surface of the amatid eggshell had a highly decorated chorion with structural difference at the anterior and posterior poles. The micropylar structure was at the anterior pole of the spherical eggs (488 ± 0.595 mm in diameter), opposite to its side of attachment to the substratum. The micropylar rosette measured 51.20 ± 0.52 mm in diameter and was formed of 15–19 petal-shaped primary cells. The micropylar opening into the micropylar canal was 3.76 ± 0.52 mm in diameter. The entire surface of the chorion had a reticulate pattern of pentagonal and hexagonal cells, each of which was boarded by 3 to 6 aeropyles of similar size (0.36 ± 0.008 mm in diameter).

Résumé

La structure fine du chorion de l'oeuf du lépidoptère ravageur de la mûre, Amata passalis F. (Lepidoptera: Amatidae), a été étudiée en microscopie électronique à balayage. La rosette micropylaire autour du micropyle, les structures de surface, les aéropyles et les différentiations régionales ont été étudiées. La surface du chorion de l'oeuf est très décorée avec une différence structurale aux pôles antérieur et postérieur. La structure micropylaire est située au pôle antérieur de l'oeuf sphérique (488 ± 0,595 mm de diamètre), à l'opposé de son point de fixation sur le substrat. La rosette micropylaire mesure 51, 20 ± 0,52 mm et est formée de 15–19 cellules primaires en forme de pétale. L'ouverture micropylaire dans le canal micropylaire a un diamètre de 3,76 ± 0,52 mm. Toute la surface du chorion présente un dessin réticulé de cellules pentagonales et hexagonales, chacune d'entre elles est bordée par 3 à 6 aéropyles de taille identique (0,36 ± 0,008 mm de diamètre).

Keywords

Amata passalisfine structureeggshellmicropylar rosetteSEMAmata passalisstructure finechorionrosette mycropylaireMET
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 23 , Issue 4 , December 2003 , pp. 325 - 330
Copyright
Copyright © ICIPE 2003

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