エゾウズムシ Dendrocoelopsis ezensis の交接のう内容物の由来と運命
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概要
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After copulation, the copulatory bursa of a freshwater planarian, Dendrocoelopsis ezensis, contained a large amount of mucus and granules. Spermatozoa were found to be embedded without forming clusters in the mucus. In their staining properties the mucus and granules found in the copulatory bursa resembled the contents found in the bulbar cavity of the partner. Therefore, it could be assumed that the said mucus and granules were secreted from the penis glands of the partner. Since the cement glands embedded in the mesenchymal tissue near the common ovovitelline duct disappeared after copulation, it may be that these glands also participated in the formation of the mucus found in the bursa, though their secretory granules were not visible under the light microscope. There was no sign of secretion into the bursal canal from the neighboring cement glands. These facts and the pattern of distribution of the granules in the lumen of the bursa stalk suggest that the contents of copulatory bursa found immediately after copulation were derived from the penis glands and the cement glands of the partner. The staining intensity of the mucus and spermatozoa found in one copulatory bursa decreased as time elapsed; suggesting the occurrence of decomposition. They were finally absorbed by the epithelial cells of the copulatory bursa. Decomposition in the bursa stalk was retarded and no sign of absorption by the epithelial cells of the stalk was observed. It is concluded that the copulatory bursa functions as temporary stocker of spermatozoa ejaculated by the partner in copulation and also as the site of decomposition and absorption of excess spermatozoa.
- 社団法人日本動物学会の論文
- 1977-03-25
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関連論文
- エゾウズムシ Dendrocoelopsis ezensis の交接のう内容物の由来と運命
- エゾウズムシ Dendrocoelopsis ezensis Ichikawa et Okugawa の交接頻度に及ぼす光と温度の影響
- 色々な明るさにおけるエゾウズムシDendrocoelopsis ezensisの交接頻度