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《Journal of Eastchina Normal University(Natural Science)》 2004-04
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Histology of the Male Reproductive System in Daphnia (Ctenodaphnia) carinata

ZHANG Ming-feng, ZHAO Yun-long, ZENG Cuo, TANG Wen-jun( School of Life Science, East China Normal University, Shanghai 200062, China ; Bioengineering College, Fujian Normal University, Fuzhou 350007, China)  
The male reproductive system of Daphnia (Ctendaphnia) carinata is composed of a pair of testes, deferens and one male gonopore. The wall of the sausage-shaped testis is composed of connective tissue and ger minal epithelium inside. The tube-shaped deferens, which gets larger at the end of it, is mainly made up of connective tissue. The spermatogenesis includes five stages: spermatogonium、 primary spermat-ocyte、 secondary spermatocyte、spermatid and spermatozoon. The mature sperm is clubbed and the spermatogenesis shows a tendency of synchronization. The sexual maturation experiences four stages. The male reproductive system retains its primitive characters on structure and function, but it has also made up its a-daptability through the long-time evolution, which enables Daphnia (Ctenodaphnia) carinata and other species of Cladocera to live with the changeable living enviro nment.
【Fund】: 高等学校博士点基金(20010269102)
【CateGory Index】: Q954.6
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