Fertilization Process in the Arrow Worm Spadella cephaloptera (Chaetognatha).(Developmental Biology)
スポンサーリンク
概要
- 論文の詳細を見る
To reveal the fertilization process of arrow worms, oocytes from fixed specimens of Spadella cephaloptera were isolated and observed by staining fluorescent nucleic acid dyes. Fully grown oocytes with a germinal vesicle (GV oocytes) are associated with an accessory fertilization cell (AFC), which is easily removed from the oocyte during isolation. Oocytes after germinal vesicle breakdown (GVBD oocytes) do not have an AFC and are at the metaphase of the first meiosis. In most cases GVBD oocytes contain a small bright spot that is regarded as a condensed sperm chromatin. In rare cases the sperm chromatin in GVBD oocytes has the form of a thin-thread (20μm long) which corresponds to the sperm nucleus immediately after fertilization. Therefore, fertilization occurs at the first meiotic metaphase after disappearance of the AFC. Numerous zygotes from a single ovary have an hourglass shape, indicative of passage of ovulating eggs into the oviducal complex. Thus, ovulation occurs after fertilization in S. cephaloptera as reported in the genus Sagitta.
- 社団法人日本動物学会の論文
- 1999-02-15
著者
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Goto Taichiro
Department Of General Thoracic Surgery National Hospital Organization Tokyo Medical Center
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Goto Taichiro
Department Of Biology Faculty Of Education
関連論文
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- Developmental fates of the first four blastomeres of the chaetognath Paraspadella gotoi : Relationship to protostomes
- FEEDING RESPONSES OF THE ARROW WORM, SAGITTA CRASSA (CHAETOGNATHA), TO THE CHEMICAL STIMULATION(Genetics & Behavior Biology and Ecology)(Proceedings of the Seventy-Third Annual Meeting of the Zoological Society of Japan)
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