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Spermatogenesis and Sperm Ultrastructure of the Equilateral Venus, Gomphina veneriformis (Bivalvia: Veneridae)  

Park, Chae-Kyu (Yeonam High School)
Park, Jung-Jun (Department of Aqualife Medicine, College of Fisheries and Ocean Science, Yosu National University)
Lee, Jeong-Yong (Gangneung Hatchery, National Fisheries Research and Development Institute)
Lee, Jung-Sick (Department of Aqualife Medicine, College of Fisheries and Ocean Science, Yosu National University)
Publication Information
Applied Microscopy / v.32, no.4, 2002 , pp. 303-310 More about this Journal
Abstract
Spermatogenesis and sperm ultrastructure are investigated by means of light and transmission electron microscopy in the equilateral venus, Gomphina veneriformis which is dominant bivalve in the east coast of Korea. In the active spermatogenic season, testis consists of numerous spermatogenic follicles which is contains germ cells in the different developmental stage. The spermatogonia attached to spermatogenic follicle wall and has a large nucleus with electron-dense nucleolus. The spermatocytes are characterized by appearance of synaptonemal complex and well-developed Golgi complex. Nucleus of spermatid consists of numerous heterogeneous granules with high electron density. Karyoplasmic condensation, acrosome and flagellum formations are observed during spermiogenesis. Testicular matured sperms of sperm bundle consists of head, midpiece and tail. The head is about $8.5{\mu}m$ long and comprises a long nucleus and a bullet-like acrosome ($8.5{\mu}m$ in length). Acrosomal rod of microfilaments is observed in the lumen between nucleus and acrosome. The midpiece has four mitochondria. And tail has the typical '9+2' microtubule system.
Keywords
Gomphina veneriformis; Spermatogenesis; Ultrastructure;
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