Published in: Abstracts Memorabilia of National Symposium on Comparative Endocrinology and Reproductive Physiology: Current Advances
Publisher: Indian Society of Comparative Endocrinology
Andrew R.J., Kadwey M., Mudaliar Srishti
The post-ovarian genital complex of the damselfly Ceriagrion coromandelianum is located on the eighth abdominal sternum, just beneath the terminal abdominal ganglion. It is ectodermal in origin and consists of bursa copulatrix, spermatheca and vagina. The spermathecae open into the bursa copulatrix through a short spermathecal duct, while the bursa copulatrix opens into the vagina through spiny valve, the bursa communis. The Bursa communis is modeled to hold the anterior tip of the egg containing the micropylar apparatus for effective fertilization. The whole complex is internally lined with a thick sclerotised layer of cuticle, which forms large plates in the vagina. These plates help in the positioning and transportation of eggs during fertilization and oviposition. The eggs are spindle shaped, with pointed anterior and rounded posterior ends. Scanning and electron microscopic examination of the egg shell reveals that the surface is smooth without any reticulations. Five microyplar orifices are situated below the apex of the anterior end. The chorion is divided into a thin smooth exochorion and a thick endochorion. The vitelline membrane is smooth and thin in freshly laid eggs, but is thick and pitted in mature eggs. The egg shell exhibits microphological modifications to cope with the endophylic mode of oviposition.
Publisher: Indian Society of Comparative Endocrinology
Andrew R.J., Kadwey M., Mudaliar Srishti
The post-ovarian genital complex of the damselfly Ceriagrion coromandelianum is located on the eighth abdominal sternum, just beneath the terminal abdominal ganglion. It is ectodermal in origin and consists of bursa copulatrix, spermatheca and vagina. The spermathecae open into the bursa copulatrix through a short spermathecal duct, while the bursa copulatrix opens into the vagina through spiny valve, the bursa communis. The Bursa communis is modeled to hold the anterior tip of the egg containing the micropylar apparatus for effective fertilization. The whole complex is internally lined with a thick sclerotised layer of cuticle, which forms large plates in the vagina. These plates help in the positioning and transportation of eggs during fertilization and oviposition. The eggs are spindle shaped, with pointed anterior and rounded posterior ends. Scanning and electron microscopic examination of the egg shell reveals that the surface is smooth without any reticulations. Five microyplar orifices are situated below the apex of the anterior end. The chorion is divided into a thin smooth exochorion and a thick endochorion. The vitelline membrane is smooth and thin in freshly laid eggs, but is thick and pitted in mature eggs. The egg shell exhibits microphological modifications to cope with the endophylic mode of oviposition.
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