External morphology of eri (Samia cynthia ricini Boisduval) egg during embryonic development

Lemuel  M. Diamante,; Parama  V. Ramakrishna,

External morphology of eri (Samia cynthia ricini Boisduval) egg during embryonic development

Parama VR. Ramakrishna | Lemuel M. Diamante

Abstract:

Reddy D.N.R. and K.C. Narayanaswamy. 2000. External morphology oferi (Samia cynthia ricini Boisduval) egg during embryonic development.Ann. Trop. Res. 22[1&2]:52-59. This study was conducted to gain better understanding of the features of eri (Samia cynthia ricini Boisduval) egg during progressive embryonic development. The eri egg is oval, flat and broader at the anferior region. The follicular imprints are evenly distributed over the chorion. The creamy white egg colour changed to grayish/bluish on the eighth day. The length and width of egg changed on the eighth day after oviposition. The egg mean length was positively related with its width (r=0.9938). Except for an increase on the third day, there was a gradual reduction in egg weight through progressive embryonic development.

References:

BASAIAH J.M.M. 1989. Consumption and utilization of acastor and tapioca by eri silkworm (Samia cynthia ricini Boisduval). M.Sc. Thesis, University of Agricultural Sciences, Bangalore, India.
CHAPMAN R.F. 1972. The Insect Structure and Functions. English Universities Press Ltd.
DEVAIAH M.C., R. GOVINDAN and C. THIPPESWAMY. 1984. Economics of rearing eri silkworm (Samia cynthia ricini Boisduval) on castor (Ricinus communis L.). Indian J. Seric. 23:117-120.
HINTON Μ.Ε. 1981. Biology of Insect Eggs. Vol. 2. Pergaman Press, New York.
JOLLY M.S. and S.K. SEN. 1969. Pattern of follicular imprints on the egg shell, a species specific character in Antheraea (Lepidoptera: Saturniidae)-II. Bull Ent. Soc. India. 10:32-38.
JOLLY M.S. and S.K. SEN. 1974. Pattern of follicular imprints on the egg shell, a species specific character in Antheraea (Lepidoptera: Saturniidae)-II. Indian J. Seric. 13:36-43.
KARISSON B. and C. WIKLUND. 1985. Egg weight variations interrelations to egg mortality and starvation endurance of newly hatched larvae in some Satryd butterflies. Ecol. Entomol.10:205-211.
KAWAKAMI T., F. NAKAJIMA and K. TANAKA. 1980. Surface structure of egg shell in Japanese Tussar (Antheraea yamamai) and Chinese Tussar (Antheraea pernyi) Saturniidae: Lepidoptera. Japanese J. Appl. Ent. Zool. 24:241-245.
KRISHNAPPA B.L. 1989. Embryology of Samia cynthia ricini Boisduval (Lepidoptera: Saturniidae). M.Sc. (Agri.) Thesis, University of Agricultural Sciences, Bangalore, India.
LEFROY H.M. and C.C. GOSH. 1912. Eri Silk. Mem. Dept. Agric. India. 4:1-130.
NAMBIAR P.M., N.A. PRAKASH and K.P. GOPINATHAN. 1991. Ultra structure of the head, spinneret and egg of eri silkworm, Philosamia ricini. Sericologia. 31:493-511.
NARASIMHANNA Μ.Ν. 1985. Silkworm seed organization and seed technology for India during seventh plan. Indian Silk. 24(4):22-26.
SHAMACHARY and M.S. JOLLY. 1985. Observations on the pattern of egg driage in three silkworm breeds Bombyx mori L. Indian J. Seric. 24:83-84.
SUNDARARAJ N., S. NAGARAJU, M.N. VENKATARAMU and M.K. JAGANNATHA. 1972. Design and Analysis of Field Experiments. UAS, Bangalore.