青森県産淡水棲プラナリア, キタシロウズムシとキタシロカズメウズムシの再生能, 特に北海道産との比較検討

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The present paper deals with the regenerative capacities of transverse pieces of two species of Japanese freshwater planarians, Dendrocoelopsis lactea and Polycelis sapporo from Aomori Prefecture, especially as compared with those of the same species from Hokkaido. Dendrocoelopsis lactea from Sapporo has two pairs of principal eyes. In the same species from Kuroishi, Aomori Pref., however, one or two pairs of principal eyes are found. Furthermore, the capacity for head regeneration of this species differs between the animals from these two localities. That is, the head-frequency curve of the animals from Hokkaido decreases from anterior levels along the main axis of the body, especially at the levels posterior to the pharyngeal base. On the other hand, the curve of the animals from Aomori Pref. falls to zero in the tail region, although it shows a curve similar to that to the animals from Sapporo. As far as the eyespotnumber variation of Polycelis sapporo is concerned, there is no remarkable difference between Hokkaido and Aomori Pref. However, the head-frequency of the species from Aomori Pref. is higher than that of the same species from Hokkaido. In this paper, furthermore, it has been revealed that the head-frequency curves of planarians can be classified into eight types, as shown if Fig. 6.
1978-09-25