Germ Cell Differentiations during Spermatogenesis and Taxonomic Values of Mature Sperm Morphology of Atrina (Servatrina) pectinata (Bivalvia, Pteriomorphia, Pinnidae)
Germ Cell Differentiations during Spermatogenesis and Taxonomic Values of Mature Sperm Morphology of Atrina (Servatrina) pectinata (Bivalvia, Pteriomorphia, Pinnidae)
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发表时间：
2012-03
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通讯作者：
Hee-Woong Kang;E. Chung;Jin Hee Kim;Jae Seung Chung;Ki-Young Lee
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作者：
Hee-Woong Kang;E. Chung;Jin Hee Kim;Jae Seung Chung;Ki-Young Lee
通过透射电子显微镜观察，研究了雄性锯齿螺精子发生过程中生殖细胞分化和成熟精子形态的超微结构特征。辅助细胞在细胞质中含有大量的糖原颗粒和脂滴，被认为参与了生殖细胞发育的营养供应。形态上，精核为卵圆形，顶体为圆锥形。顶体小泡由两种电子致密或透明物质组成，从顶体底部到顶端：顶体小泡的外部(区域)出现一条细长的椭圆线，由电子致密的不透明物质组成；顶体小泡的内部(区域)由顶体小泡内的电子透明物质组成。两个特殊的特征可作为分类检索表或重要工具用于系统发育和分类分析。这两个特征是发现于鳍科(翼形亚纲)中的一种顶体囊泡。精子长约45-50㎛，包括精子核(约1.43㎛)、顶体(约0.51㎛)和尾鞭毛(约46-47㎛)。精子尾部的轴丝显示为9+2结构。
The ultrastructural characteristics of germ cell differentiations during spermatogenesis and mature sperm morphology in male Atrina (Servatrina) pectinata were evaluated via transmission electron microscopic observation. The accessory cells, which contained a large quantity of glycogen particles and lipid droplets in the cytoplasm, are assumed to be involved in nutrient supply for germ cell development. Morphologically, the sperm nucleus and acrosome of this species are ovoid and conical in shape, respectively. The acrosomal vesicle, which is formed by two kinds of electron-dense or lucent materials, appears from the base to the tip: a thick and slender elliptical line, which is composed of electron-dense opaque material, appears along the outer part (region) of the acrosomal vesicle from the base to the tip, whereas the inner part (region) of the acrosomal vesicle is composed of electron-lucent material in the acrosomal vesicle. Two special characteristics, which are found in the acrosomal vesicle of A. (S) pectinata in Pinnidae (subclass Pteriomorphia), can be employed for phylogenetic and taxonomic analyses as a taxonomic key or a significant tool. The spermatozoa were approximately 45-50 ㎛ in length, including a sperm nucleus (about 1.43 ㎛ in length), an acrosome (about 0.51 ㎛ in length), and a tail flagellum (about 46-47 ㎛). The axoneme of the sperm tail evidences a 9+2 structure.