Chorion morphology of eggs of the North American stink bug <i>Euschistus variolarius</i> (Palisot de Beauvois, 1817) (Heteroptera: Pentatomidae): A scanning electron microscopy study

Candan S., Suludere Z., Acikgoz F.

ENTOMOLOGICAL NEWS, vol.116, no.3, pp.177-182, 2005 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 116 Issue: 3
  • Publication Date: 2005
  • Journal Name: ENTOMOLOGICAL NEWS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.177-182
  • Keywords: Heteroptera, Pentatomidae, Euschistus variolarius, chorion, external morphology, aero-micropylar process, egg-burster, scanning electron micrographs, HEMIPTERA
  • Gazi University Affiliated: Yes

Abstract

Eggs of Euschistus variolarius (Palisot de Beauvois, 1817) were examined with light and scanning electron microscopes (SEM). Eggs are deposited in clusters of generally 13-14 eggs per mass. The barrel-shaped eggs are about 1.15 mm long and 0.98 mm in width. Newly deposited eggs are light green and darkened color after the onset of embryonic development. The first external evidence of embryonic development is the appearance of paired red eye spots next to aero-micropylar processes. Subsequently the blackish T-shaped egg-burster appears between the eye spots. On the egg surface, polygons formed by spikes are clearly detectable using scanning electron microscopy. This chorionic pattern is usually referred to "as spinose chorion." The circular hatching line surrounds the operculum. There are 30-35 pipe-shaped aero-micropylar projections at the anterior rim of the egg.