淡水産二枚貝イケチョウガイの精子形成過程の電子顕微鏡的研究

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The present paper reports an electron microscope study of spermatogenesis in Hyriopsis schlegelii, mother mussel of fresh-water pearl in the lake Biwa-ko. In the spermatid the nucleus undergoes profound changes as development proceeds, affect-ing both its form and internal fine structure. A large number of roughly parallel, dense filaments, arranged along the long axis of the nucleus, fuse with each other to form in the end, the homogenous body characteristic of the head of the adult spermatozoa. The nebenkern is. apparently mitochondria) in nature and, in its early development, is similar to that of insects. In the early spermatid, all the mitochondria are collected into a single nebenkern which is. then divided into two spherical bodies. The nebenkern are similar in shape and structure to the original mitochondria and differ only in their large size. In the last stages of develop-ment, the nebenkern divided into five spherical bodies around the axial fibrils of developing-tail flagellum. The axial fibrous components of the tail flagellum is composed of nine peripheral pairs of filaments and a pair of central filaments.
公益社団法人日本水産学会の論文