著者

岩澤 久彰 二上 順子

出版者

日本爬虫両棲類学会

雑誌

爬虫両棲類学雑誌 (ISSN:02853191)

巻号頁・発行日

vol.14, no.3, pp.129-142, 1992-06-30 (Released:2009-03-27)

参考文献数

18

被引用文献数

11

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Male and female specimens of Hyla japonica were collected from a paddy field in a suburb of Niigata City in the breeding season (May), and naturally spawned eggs were obtained in the laboratory. The eggs were ca. 1.3mm in diameter. The eggs and embryos were reared under a constant temperature of 24C, which is the average water temperature in the paddy field in this period. 4.4 days after fertilization, the formation of the operculum was completed, and the larvae began feeding. Thereafter the larvae were reared at room temperature (24-29C). They were fed a commercial diet for goldfish. The larvae of this species are a nektonic type in external appearance, and the labial teeth formula is 1:1+1/3. Under the present rearing conditions, the total length of full-grown larvae was 47mm on the average. The larvae metamorphosed at the age of 32 days, and the body length of newly metamorphosed frogs was 14.5mm on the average. According to Gosner's table (1960), the process of development from just after spawning till the completion of metamorphosis is divided into 46 stages. The external characteristics in each stage are described in tabular form in English, and illustrated with sketches.

著者

岩澤 久彰

出版者

日本両生類研究会

雑誌

両生類誌 (ISSN:13467972)

巻号頁・発行日

no.2, pp.43-47, 1999-07

著者

岩澤 久彰 山下 香

出版者

日本爬虫両棲類学会

雑誌

爬虫両棲類学雑誌 (ISSN:02853191)

巻号頁・発行日

vol.14, no.2, pp.39-62, 1991-12-31 (Released:2009-03-27)

参考文献数

17

被引用文献数

56

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A table for the normal stages of development of a hynobiid salamander, Hynobius nigrescens Stejneger, is presented. The materials used in the present study were collected from a breeding pond in Iwamuro-mura, Niigata Prefecture. The eggs were ca. 2.6mm in diameter. The larvae were fed on Tubifex. Under a constant temperature of 17°C, the larvae metamorphosed at the age of 80 days. and the total length of these metamorphosed animals was 53.4mm on the average. The ratio of body length, measured from the tip of the snout to the posterior angle of the vent, to total length in the metamorphosed animals was 58.3% on the average in 63 individuals. The process of development from just after spawning till the completion of metamorphosis is here divided into 73 stages. External characteristics in each stage are described in tabular form, and illustrated with sketches.