1 0 0 0 天竜川上流三峰川で採捕されたアマゴとヤマメとの間種
- 著者
- 大島 正満
- 出版者
- 日本動物学会
- 雑誌
- 動物学雑誌 (ISSN:00445118)
- 巻号頁・発行日
- vol.68, no.7, pp.259-262, 1959-07
It was affirmed previously by means of continuous breeding experiments carried on by the former Director of the Fisheries Experiment Station of Gifu Prefecture(1924-1927) that the hybrid between the sea-run type of Oncorhynchus masou and river-type of Oncorhynchus rhodurus is fertile, while the back-cross between F_1 and the latter is entirely sterile instead. The most clear specific difference between the two river-types of the above mentioned Oncorhynchus are (1) the colouration of the round spots scattered above and below of the lateral line and (2) arrangement of the circuli in the somatic scales. In the artiffcially crossed hybrid black spots of Oncorhynchus masou reveals as an apparently dominant character while crimson spots of Oncorhynchus rhodurus subsides as recessive character while the concentric circular circuli of Oncorhynchus rhodurus becomes dominant to the broken external circuli of Oncorhynchus masou. Whether such cross exists in nature or not was a question among ichthyologists long time since. Quite recently, however, dubiuous specimens supposed to be the river from of Oncorhynchus masou have been obtaind in the upper stream of Tenriu River, mingling with 'Amago' the river-type of Oncorhynchus rhodurus. Specimens obtained by Mr. Takeo Iwasaki of Ina City has been forwarded very kindly for examination. The writer came to conclusion that the specimens exposed is really the hybrid between two species of Oncorhyuchus although intrudence of Oncorhynchus masou into Tenriu tributaries is not solved yet. In the present paper is given the description of naturally produced hybrid between Oncorhynchus masou and Oncorhynchus rhodunus, given the new name Oncorhynchus hybridus sp. nov. (Japanese name 'Hiraki-masu'). Appreciations are due to Mr. Takeo Iwasaki by whose efforts such interesting specimens came to the writer's hand.
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.
1 0 0 0 OA 脊椎動物の分布上より見たる渡瀬線
1 0 0 0 七面鳥の単為発生胚の形態形成能(発生)
1 0 0 0 OA ウニ卵の受精における卵内pHの上昇の役割(発生学)
1 0 0 0 マガモ雌の所謂「雄化」4例
- 著者
- 黒田 長礼
- 出版者
- 日本動物学会
- 雑誌
- 動物学雑誌 (ISSN:00445118)
- 巻号頁・発行日
- vol.69, no.9, pp.277-279, 1960-09
In Japan there have been collected only four wild specimens of what we call the Female Mallard assuming the male plumage. Among these intersex specimens, no. 2 example which came from Teganuma, Chiba Prefecture, was studied by Dr.Yamashina ('48) and was found to have had its right and left ovaries turned into testes. Concerning the remaining examples the same phenomena have been seen in the old females, such as the Mandarin Duck, the Teal and the Pintail, which must have been brought about by the shrinkage or some other disorder of their ovaries. Bluba ossea, an organ belonging to trachea, peculiar to the male duck, does not exist in these intersex specimens and proved not te be affected by means of sex hormone.
1 0 0 0 OA ハイドラに就ての試驗
1 0 0 0 OA 大島近海採集旅行の記
1 0 0 0 多足類の分類学的並びに形態学的研究-8-
- 著者
- 篠原 圭三郎
- 出版者
- 日本動物学会
- 雑誌
- 動物学雑誌 (ISSN:00445118)
- 巻号頁・発行日
- vol.72, no.10, pp.300-302, 1963-10
Nedyopus venustus sp. nov. Body Iength about 18mm, width about 1.3mm in the male. General colour is brown with a wide light longitudinal stripe extending on the middorsal surface the collum to the tail excluding the head. The keels, sternites and legs are yellow but tibia and tarsus of legs have a brown tinge. The dorsal surface is glabrous, and many conspicuous furrows are present on lateral and upper surfaces of the keel. The lateral carinae extend from the first to the sixth dorsal segment, the seventh and posterior segments having none. The fifth sternite of the male possesses a hairly flat lamina, the anterior margin of which curved in slightly. Gonopod of male : Hairly prefemur has a small process on the inner surface of its distal end. the base of femur is not retrograde as is that of N. tambanus, but expands markedly in a proximal direction as shown in the figure. The seminal groove branch runs forward or downward. Ratio of length to width of the male gonopod excluding the prefemur is about 2 : 1. Holotype : One male, Mt. Kirishima of Pref. Kagoshima, April 22, 1956 collected by Mr. S. Koshiyama, and preserved in the auther's collection. Kopidoiulus longus sp. nov. Body length is about 38mm in the male. The general colour is darkish brown, but metazonite possessas brown spots, and the dorsum seems to have many lateral stripes on account of the light stripes on the posterior of each segment. The sternites and the legs are yellow. The anal segment is deep brown. The number of segments is 49. The crypeus is hairly, but setigerous foveolae possess 2 + 2. Ocelli number about thirty. Few transverse furrows are present on the prezonites, and the striate portions of metazonites exist below the level of the repugnatorial pores, the dorsal surface being smooth. The first legs are transformed into long, stiff and stick-like five articles curved deeply as a whole. At the distal end of the fifth article is situated a very small process which is probably a degenerate claw. Gonopod : The anterior gonopod consists of a telopodite and a coxal process. Telopodite is spindle shaped having a seta on the inner surface of the distal end. The coxal process is long, with a small blade situated on one side of the distal half, and a few short seta-like processes on the basal half. Posterior gonopod is a long, slightly bent slender blade, with a ciliated end. The gonopods of the male are represented in the figure. Holotype : One male, Mt. Daisetsu, Hokkaido, July 24, 1957, collected by Dr. H. Kobayashi, and preserved in the auther's collection.