The Development of the Hermaphroditic Gonad in Four Species of Dicyemid Mesozoans

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概要

• 論文の詳細を見る

• The development of the functionally hermaphroditic gonad, the infusorigen, in four dicyemid species, Dicyema orientale, D. acuticephalum, D. japonicum, and D. misakiense, was studied in fixed materials with the aid of a light microscope. After an agamete (axoblast) undergoes the first division and excludes a paranucleus, the resulting cell undergoes the second division. Afterwards, three different types of cell lineage can be identified. (1) In D. orientale, the first oogonium is produced by the second division, and the axial cell of an infusorigen and the first spermatogonium are produced by the third division. (2) In D. acuticephalum, the first oogonium is produced by the second division, the axial cell is produced by the third division, and the spermatogonium is produced by the fourth division. The fourth division also produces the first oogonium of another egg line. (3) In D. japonicum and D. misakiense, the first spermatogonium is produced by the second division, and the axial cell and the first oogonium are produced by the third division. In all species examined, oogonia occupy the outer surface of the axial cell and spermatogonia are incorporated into the axial cell. In this way, the spermatogenesis proceeds within the cytoplasm of the axial cell. Mature infusorigens of these four species consist of about twenty cells. The respective numbers of oocytes and spermatozoa produced in each infusorigen are roughly equal in these four species.

• 社団法人日本動物学会の論文
• 1993-06-15

著者

• Furuya Hidetaka

  Department of Biology, Graduate School of Science, Osaka University

• Tsuneki Kazuhiko

  Department of Biology, Graduate School of Science, Osaka University

• Furuya H

  Osaka Univ. Osaka Jpn

• Furuya Hidetaka

  Department Of Biology Graduate School Of Science Osaka University

• Tsuneki K

  Department Of Biology Graduate School Of Science Osaka University

• Tsuneki Kazuhiko

  Department Of Biology Graduate School Of Science Osaka University

• Tsuneki Kazuhiko

  Deapartment Of Biology Graduate School Of Science Osaka University

• Tsuneki Kazuhiko

  Misaki Marine Biological Station Faculty Of Science University Of Tokyo:(present Address)department

• Tsuneki Kazuhiko

  Department Of Biology Osaka University

• KOSHIDA Yutaka

  Department of Biology, Graduate School of Sicience, Osaka University

• Koshida Y

  Department Of Biology Graduate School Of Sicience Osaka University

• Koshida Yutaka

  Department Of Biology Faculty Of Science Osaka University

• Furuya Hidetaka

  Department Of Anatomy Tokyo Dental College

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