著者

Kakui Keiichi Fukuchi Jun Shimada Daisuke

出版者

Springer

雑誌

Parasitology Research (ISSN:09320113)

巻号頁・発行日

vol.120, no.6, pp.2357-2362, 2021-06

被引用文献数

7

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Nectonema, the only horsehair worm (Nematomorpha) genus found in marine environments, was previously known to be parasitic only in decapod crustaceans. We report Nectonema sp. as the first record of a marine nematomorph parasitic in isopod crustaceans. This is also the third record of marine nematomorphs from the North Pacific. Six infected isopods (Natatolana japonensis) collected from 1425 m of depth in the Sea of Japan each contained one to seven (mean 2.33) nematomorphs in the body cavity in the pereon. There was no correlation between the host body length and number of parasites. For Nectonema sp., we describe and illustrate morphological features of the parasitic juvenile stage and present nucleotide sequences for the cytochrome c oxidase subunit I gene (COI or cox1; 451 nt), 18S rRNA gene (1777 nt), and region spanning the internal transcribed spacer 1 (ITS1) and the 28S rRNA gene including the 5.8S rRNA gene and ITS2 (1218 nt in total). In an 18S maximum-likelihood tree that included 24 nematomorph species, Nectonema sp. grouped with N. agile from the northwestern Atlantic; the 18S gene from these two taxa was divergent by 11.8% K2P distance, suggesting that they are different species. Nectonema species may have a broader range of host groups than previously suspected, but may have been previously misidentified as nematode parasites.

著者

Kakui Keiichi Shimada Daisuke

出版者

Cambridge University Press

雑誌

Journal of Helminthology (ISSN:0022149X)

巻号頁・発行日

vol.96, pp.e33, 2022

被引用文献数

7

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We report the first mermithid nematode found to be parasitic in a marine tanaidacean crustacean. Ten host tanaidaceans were collected from 52 m depth in Otsuchi Bay, Iwate, Japan, northwestern Pacific, and identified as a species in the tanaidid genus Zeuxo Templeton, 1840. Nematodes occurred in the host’s body cavity; in one case, at least two individuals inhabited a single host. We provide a brief description and illustrations of the morphology of the nematode. In a phylogenetic reconstruction based on the 18S rRNA gene, the nematode nested in a clade otherwise containing mermithids from terrestrial or freshwater hosts, showing an expansion in host utilization in Mermithidae Braun, 1883 from terrestrial/freshwater hosts to a marine organism.

著者

Shimada Daisuke Kakui Keiichi

出版者

Zoological Society of Japan

雑誌

Zoological Science (ISSN:02890003)

巻号頁・発行日

vol.39, no.1, 2022-02

被引用文献数

1

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We describe three free-living marine nematode species from Sagami Bay, Japan. Wiesoncholaimus jambio sp. nov. is the second species of this genus. It differs from the type species, Wiesoncholaimus mawsonae Inglis, 1966, by its dorsal tooth, which is as long as the other two teeth; its conicocylindrical tail, which is as long as 4.6–4.8 cloacal body diameters; and the absence of the gubernaculum. Thalassironus cf. britannicus de Man, 1889 agrees well with a redescription of Thalassironus britannicus de Man, 1889 based on specimens collected near the type locality. However, as it is possible that T. britannicus sensu lato includes two or more species, our species may not be conspecific to T. britannicus sensu stricto. Vasostoma cf. longispicula Huang and Wu, 2010 closely resembles Vasostoma longispicula Huang and Wu, 2010 originally described from China, but minor differentiations are observed in body diameter, body cuticle thickness, and type of precloacal supplements.

著者

KAKUI KEIICHI SHIMADA DAISUKE

出版者

Magnolia Press

雑誌

Zootaxa (ISSN:11755326)

巻号頁・発行日

vol.4282, no.2, pp.324, 2017

被引用文献数

10

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We describe Tanaopsis japonica sp. nov. from intertidal and nearshore habitats around Hokkaido Island, northern Japan. This species closely resembles T. chotkarakde Bird & Bamber, 2000 and T. rawhitia Bird, 2011 in having the uropod with the endopod biarticulate and the exopod uniarticulate, but differs from them in the following characters: pereonite 4 as long as pereonite 5; mandibles lacking the molar; the number of simple setae on the antenna, propodal palm, and dactylus of pereopods 1–3; the number of spiniform setae on the cutting surface of the chelipedal dactylus; and the number of setae on the pleopods. We also determined a nearly complete nucleotide sequence for the 18S rRNA gene in T. japonica. In both sexes, Tanaopsis japonica sp. nov. bears serial ridges and grooves on the chela, antennule, and antenna. Parallel, fringed hatch marks on the chelipedal dactylus may function in stridulation. A series of denticulate ridges on the dorsal surface of antennal article 2 faces the ventral side of article 1 of the antennule, where there is a ventral series of slight grooves. Although the ranges of motion of the antennule and antenna were unclear, the ridges and grooves on the antenna and antennule may also function in producing sound. Two outer series of ridges on the chela, together with an outer furrow on the chela, may function in digging, by allowing bottom-sediments to be efficiently pushed aside.

著者

島田 大輔 シマダ ダイスケ Shimada Daisuke

出版者

同志社大学一神教学際研究センター(CISMOR)

雑誌

一神教世界 = The world of monotheistic religions (ISSN:21850380)

巻号頁・発行日

vol.6, pp.64-86, 2015-03-31

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本稿は、戦前期日本における回教政策に関して、大日本回教協会を中心に実証・分析を加えたものである。従来の研究では、一次史料の収集・比較分析は不十分であり、必ずしも実態が明らかではなかった。第一に、あまり分析されてこなかった四王天延孝会長期も含めて、回教協会の組織運営・諸活動の実態を通史的に明らかにした。第二に、日本政府からの補助金・事業指示の分析をもとにして、大日本回教協会を、外務省の回教政策を実行するために設立された、外務省の外郭団体だと明らかにした。第三に、陸軍の回教政策とは異なった観点に立つ、外務省の回教政策の内実を明らかにした。外務省の回教政策とはすなわち、中東を中心に全イスラーム世界を対象とし、手法として文化工作を最重視することであった。極東占領地内に回教政策を局限した陸軍との間にはある種の棲み分けがなされていた。ただし、戦局の悪化、回教協会に対する大東亜省の影響力増の結果、以上の図式は崩されることになった。This article focuses on the Islamic policy in prewar Japan. First, it traces the activities and organizational management of the Dai Nippon Kaikyo Kyokai (DNKK), from beginning to end. Secondly, by analyzing the business instructions and subsidies for the DNKK from the Japanese government, it becomes clear that the DNKK was established in order to execute the Islamic policy of the Ministry of Foreign Affairs (MFA). Thirdly, it makes clear the Islamic policy of the MFA, which takes a different point of view from the Army. The Islamic policy of the MFA targeted the entire Islamic world centering on the Middle East, and gave paramount weight to cultural activities. At first, segregation of the Islamic policy had been made between the MFA and the Army, because the Army confined its Islamic policy only in the occupied territories in the Far East. However, such segregation was collapsed later, as a result of the deterioration of the war situation and increased influence of the Ministry of Greater East Asia for the DNKK.