恒温飼育のナミウズムシ Dugesia japonica japonica の産卵と孵化

概要

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A study was made on cocoon-production in the planarian Dugesia japonica japonica, obtained from an artificial pond on the campus of Tokyo Agricultural College, Fuchu, Tokyo (Tokyo-Fuchu stock). Animals were cultured under five constant temperature conditions, i.e., 5, 10, 12, 15, and ca. 20℃ (regulated room temperature). Two to three hundred animals were used in each experimental lot. In the cultures of 10-month-duration (5℃ and 10℃) and 28-month-duration (15℃), the planarians studied produced cocoons nearly the year around. The juveniles emerged only from the cocoons transferred to the culture at room temperature just after the cocoon-production. According to the data of 15 incubated cocoons, the period of incubation for cocoons is 19 to 41 days at a temperature of about 20℃ (average, 31.3 days). The average number of juveniles produced per cocoon is 1 to 2. Their bodies measured 1 to 7 mm in length at birth (average, 3.7 mm). Normal cocoons were produced by the animals cultured under the no-feeding conditions for 41 days.
社団法人日本動物学会の論文
1981-06-25