サメ類の研究-XIII.アイザメ精子形成の微細構造について

抄録

Fine structure in every stage of spermatogenic cells of the squalen shark, Centrophorus atromarginatus Garman, from Suruga Bay was observed by means of an electron microscope. Selachian spermatogenesis, as in other vertebrates, consists of two periods, spermiocytogenesis and spermiohistogenesis. The former is similar to that of mammalians but different from that of teleost fishes. While the latter has special characteristics compared to other vertebrates, especially in the form of mature spermatozoon. These two periods of selachian spermatogenesis are discussed in comparison with mammalians, reptilians, amphibians and teleost fishes.