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ISSN : 1225-3480

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26권 1호

Ultrastrucure of Germ Cells during Spermatogenesis and Some Characteristics of Sperm Morphology in Male Mytilus coruscus (Bivalvia: Mytilidae) on the West Coast of Korea

Ultrastrucure of Germ Cells during Spermatogenesis and Some Characteristics of Sperm Morphology in Male Mytilus coruscus (Bivalvia: Mytilidae) on the West Coast of Korea

Kim, Jin-Hee (Korea Inter-University Unstitute of Ocean Science, Pukyong National University)
Chung, Ee-Yung (Korea Marine Environment & Ecosystem Institute, Dive Korea)
Choi, Ki-Ho (West Sea Fisheries Research Institute, National Fisheries Research and Development Institute)
Park, Kwan-Ha (Department of Aquatic Life Medicine, Kunsan National University)
Park, Sung-Woo (Department of Aquatic Life Medicine, Kunsan National University)
한국패류학회지 / The Korean Journal of Malacology, (P)1225-3480;
2010, v.26 no.1, pp.33-43
Kim, Jin-Hee, Chung, Ee-Yung, Choi, Ki-Ho, Park, Kwan-Ha, & Park, Sung-Woo. (2010). Ultrastrucure of Germ Cells during Spermatogenesis and Some Characteristics of Sperm Morphology in Male Mytilus coruscus (Bivalvia: Mytilidae) on the West Coast of Korea. , 26(1), 33-43.

Abstract

The ultrastructure of germ cells during spermatogenesis and some characteristics of sperm morphology in male Mytilus coruscus, which was collected on the coastal waters of Gyeokpo in western Korea, were investigated by transmission electron microscope observations. The morphology of the spermatozoon has a primitive type and is similar to those of other bivalves in that it contains a short midpiece with five mitochondria surrounding the centrioles. The morphologies of the sperm nucleus type and the acrosome shape of this species have an oval and modified cone shape, respectively. In particular, the axial rod is observed between the nucleus and acrosome of the sperm. The spermatozoon is approximately $45-50{\mu}m$ in length including a sperm nucleus (about $1.46{\mu}m$ in length), an acrosome (about $3.94{\mu}m$ in length) and tail flagellum (approximately $40-45{\mu}m$). The axoneme of the sperm tail flagellum consists of nine pairs of microtubules at the periphery and a pair at the center. The axoneme of the sperm tail shows a 9+2 structure. Some special charateristics of sperm morphology of this species in the genus Mytilus are (1) acrosomal morphology, (2) the number of mitochondria in the midpiece of the sperm, and (3) the existence of a satellite. The axial rod appears in the acrosome and sperm nucleus as one of the characteristics seen in several species of the subclass Pteriomorphia, unlikely the subclass Heterodonta containing axial filament instead of the axial rod. The number of mitochondria in the midpiece of the sperm of this species in the family Mytilidae are five, as one of common characteristics appeared in most species in the family Mytilidae. Most of Mytilus species contain a satellite body which is attached to the proximal centriole in the middle piece of the sperm, as one of common characteristics of sperm morphology in the family Mytilidae.

keywords
Mytilus coruscus, spermatogenesis, germ cell, sperm morphology

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