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Journal of Entomology
  Year: 2007 | Volume: 4 | Issue: 2 | Page No.: 68-81
DOI: 10.3923/je.2007.68.81
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Surface Ultrastructure of the Egg Chorion of Eri Silkworm, Samia ricini (Donovan) (Lepidoptera: Saturniidae)

Vineet Kumar, B.K. Kariappa, A.M. Babu and S.B. Dandin

The eggshell of the eri moth, Samia ricini (Donovan) (Lepidoptera: Saturniidae) was investigated by scanning electron microscopy. The surface of the egg chorion of eri moth, revealed the structural elements viz., the micropylar rosette surrounding the micropyle, micropylar canals, shell imprints, aeropyles and the regional differentiation at the different poles. The oval shaped eggs were measured 820-990 (878.72±21.23) μm in length. The highly decorated chorion of S. ricini had a micropylar rosette of 45-51 (48.0±1.02) μm diameter with a centrally located micropylar pit of 2.08-2.31 (2.21±0.036) μm diameter. The micropylar pit consists of seven micropylar openings, each micropylar opening ranged from 0.26-0.28 (0.27±0.003) μm in diameter. Each micropylar opening opens into the seven distinct micropylar canals. The micropylar apparatus encircled by 11-14 petal-shaped primary unequal cells. These cells ranged from 12.0-12.9 (12.48±0.13) μm in length forming an asymmetrical rosette. The secondary petal-shaped cells were short in length and measured 8.4-9.1 (8.72±0.12) μm surrounded the primary petal cells. The entire surface of the chorion had a reticulate pattern of pentagonal and hexagonal cells, each boarded by 4-6 aeropyles of diameter 0.22-0.25 (0.23±0.05) μm. Further, the sunken aeropyles were also observed for the first time in second hemisphere of the egg and measured 0.22-0.24 (0.23±0.003) μm in diameter.
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How to cite this article:

Vineet Kumar, B.K. Kariappa, A.M. Babu and S.B. Dandin, 2007. Surface Ultrastructure of the Egg Chorion of Eri Silkworm, Samia ricini (Donovan) (Lepidoptera: Saturniidae). Journal of Entomology, 4: 68-81.

DOI: 10.3923/je.2007.68.81


16 March, 2009
Respected sirs,
an excellant work through SEM. As I am doing my Doctorate in Insect Endocrinology it become very use full for me.
i want to become in regular regular touch with you (all) sir so kindly forward e-mail id of yours.




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