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KMID : 0894520070110020097
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Development & Reproduction
2007 Volume.11 No. 2 p.97 ~ p.104
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Spermatogenesis of the Spiny Top Shell, Batillus cornutus (Lightfoot, 1786) (Gastropoda: Turbinidae)
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Jung Gui-Kwon
Park Jung-Jun
Lee Jae-Woo
Lee Jung-Sick
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Abstract
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This study describes the spermatogenesis and sperm ultrastructure of the spiny top shell, Batillus cornutus using light and electron microscopy. The spiny top shells were collected by divers in the coastal water of Wandogun, Cheollanamdo, Korea(N 34°13’, E 126°47’) at May 2003. Spiny top shells of 60.0～69.9 ㎜ in shell height were used in this study. The testis comprises many spermatogenic follicles which contains germ cells in different developmental stages. The primary spermatocytes in the pachytene stage were characterized by synaptonemal complexes. The early spermatids were characterized by appearance of Golgi complex, increased karyoplasmic electron density and tubular mitochondria. In early spermatid the mass of proacrosomal granules consists of numerous heterogeneous granules with high electron density. From the mid-stage of spermiogenesis the well-developed mitochondria aggregate posterior to the nucleus, and surround the proximal and distal centrioles. In this stage, proacrosomal granules are condensed and form a acrosome with thin envelope. During the late spermiogenesis, the acrosome begins to elongate and then became conical. The sperm consists of head, mid-piece and tail. The head comprises a round nucleus and a conical acrosome. Acrosomal rod of microfibrous is observed between nucleus and acrosome. Five mitochondria observed in mid-piece. And tail has the typical "9+2" microtubular system originates from the centrioles.
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KEYWORD
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Batillus cornutus, Spermatogenesis, Sperm morphology, TEM
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