1 0 0 0 OA タヌキの歯数異常
Deficiencies and surplus eruptions in the teeth of raccoon-dogs were examined using 340 specimens collected mainly from three localities in western Japan. Abnormalities in the dentition occurred in 26% of 308 perfect skulls. On the upper jaw, 9 examples of pm-1 deficiencies on both sides occurred, 8 on left side alone and 4 on right side alone among 317 specimens. There were no significant differences between the sexes, but differences did exist among localities. There were i-1, i-2, i-3, pm-2 and m-2 deficiencies, and i-surplus eruptions in some specimens. On the lower jaw, m-3 deficiencies occurred more frequently. Incidences of deficiencies on both sides, left and right side alone were 19, 19 and 15 respectively among 314 specimens. No significant difference was found between sexes and among localities. Other deficiencies were observed on i, pm-1, pm-2, pm-3 and pm-4. One surplus eruption occurred between c and pm-1. In one specimen, pm-4 duplications in the buccolingual direction were observed on both sides.
1 0 0 0 ウナギの血清中に存在する緑色色素蛋白質について(生化学)
- 著者
- Niwa Hisashi
- 出版者
- 東京動物學會
- 雑誌
- 動物学雑誌
- 巻号頁・発行日
- vol.49, no.2, pp.71-74, 1937
- 被引用文献数
- 2
The present new species. Cobitis delicata, is found in abundance in the upper waters. ventrals a little in front of dorsal); lower lip not divided so distinetly, and almost straight(in C. multifasciata divided distinctly and with two lobes); barbels 3 pairs and short(in C. multifasciata 4 pairs and longer); eyes very small, its diameter 6.7 in head length(4.7 in C. multifasciata).
1 0 0 0 新しい型の恙虫病における感染経路(分類・生態)
1 0 0 0 マダニの吸血量と産卵數
1 0 0 0 日本産ケダニ科(ツツガムシ類)に關する2, 3の知見
1 0 0 0 OA 九州に於けるヤマメとアマゴの分布
As the results of the extensive collections made by the writer in the year 1949 and 1950, assisted by his student Mr. Sadahiko Imai, assistant professor of the Faculty of Fisheries of Kagoshima University, in order to compilate complete list of freshwater fishes inhabit in the streams of south werstern part of Kiushiu, it was affirmed that there exist two species of freshwater salmons in the head waters of main streams, treated under the same vernacular name 'Enoha''. One of which is evidently the river form of Oncorhynchus masou (Brevoort), while the other is the same of Oncorhynchus rhodurus Jordan & McGregor. Distributional area of the two is quite distinct, the former inhabiting in the headwaters of mam rivers which flow down to Pacific while the latter's habitats are limited to the upper streams of long rivers which enter into the Inland Sea. Oncorhynchus masou is the salmon of northern element, its distributional center being Hokkaido, instead of Oncorhynchus rodurus which is the form originated in Lake Biwa in the remote past. This facts show that the Pacific coasts of Kiushiu had been washed by the cold current coming down from Japan Sea in the prehistoric time, enabling southward migration of anadromous Salmonoid fishes like Oncorhynchus masou and Oncorhynchus keta as well. Occasional occurence of the former at the offshore of Kumamoto district and usual autumn run of the latter into several rivers in northern Kiushiu supports this supposition very strongly.