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Egg Shell Architecture of the Stink Bug, Eocanthecona furcellata (Wolff.): Ultrastructure of Micropylar Processes and Egg Burster

Published online by Cambridge University Press:  19 September 2011

Vineet Kumar ,
M. N. Morrison ,
A. M. Babu  and
V. Thiagarajan
Vineet Kumar*
Affiliation:
Electron Microscopy Unit, Central Sericultural Research and Training Institute Mysore – 570 008, India
M. N. Morrison
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
V. Thiagarajan
Affiliation:
Electron Microscopy Unit, Central Sericultural Research and Training Institute Mysore – 570 008, India
*
E-mail: vinkumari [email protected]
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Abstract

Scanning electron microscopic examination of the egg shell and associated structures of Eocanthecona furcellata (Wolff.) (Hemiptera: Pentatomidae) reveals a distinct pattern of structural elements, viz. microsculpture of the chorion, pseudoperculum, egg burster and aeromicropylar processes. The egg shell has a highly decorated chorion with a structural difference at both the anterior and posterior ends. A reticulate type of microsculpture with varying sizes of spine-like projections measures 4.02 ± 0.06 to 8.12 ± 0.05 μm and forms an asteroid-like shape at the anterior pole, while the surface at the posterior end has elongated striations over the chorion measuring 72.00 ± 0.074 μm. The pseudoperculum of the egg shell is a circular lid measuring 518 ± 11.43 μm in diameter. During hatching the line of rupture follows the micropylar ring, and this sometimes extends beyond the ring of micropylar processes. An inverted T-shaped black egg burster measures 202 ± 4.63 μm in length, is well developed and can be seen prior to hatching within a thin and transparent egg shell. It is a median sclerotised part of embryonic cuticle. The aeromicropylar processes are situated at the anterior pole of the barrel-shaped eggs. There are 26–28 aeromicropylar processes arranged in a circle at almost equidistance and each micropylar process is slightly curved opposite to the pseudoperculum lid with a bulbous end at the apex. The aeromicropylar processes are 25.40 ± 0.083 μm in length and 3.02 ± 0.07 μm in width. Each micropylar process has a central canal for the passage of sperm whereas the rest of its body is porous, and allows respiratory interchange.

Keywords

Eoccinthecona furcellataegg shell architectureegg burstermicropylar processesSEMarchitecture de l'enveloppe de l'oeuflanguette d'éclosionmicropyleMEB
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 22 , Issue 1 , March 2002 , pp. 67 - 73
Copyright
Copyright © ICIPE 2002

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