タクサ:日本動物分類学会誌
Online ISSN : 2189-7298
Print ISSN : 1342-2367
50 巻
選択された号の論文の6件中1~6を表示しています
ARTICLES
  • 古𣘺 龍星, 前川 隆則, 本村 浩之
    2021 年 50 巻 p. 1-5
    発行日: 2021/02/28
    公開日: 2021/02/28
    ジャーナル オープンアクセス

    A single specimen (209.2 mm standard length) of Synodus mundyi Randall, 2009 (Aulopiformes: Synodontidae), previously recorded only from the Hawaiian and Ogasawara islands, was collected at a depth of 160 m off Amami-oshima Island, Ryukyu Islands, Japan. The specimen, described here in detail, represents the first record of the species from the Ryukyu Islands and the second record from Japan.

  • 佐々木 瑞希, 中尾 稔
    2021 年 50 巻 p. 6-10
    発行日: 2021/02/28
    公開日: 2021/02/28
    ジャーナル オープンアクセス

    Around a hundred of brachylaimid trematodes were found from the small intestine of a carrion crow (Corvus corone) in Hokkaido, Japan. Based on the result of mitochondrial DNA barcoding, the parasites were identified as Brachylaima ezohelicis Nakao, Waki and Sasaki, 2017. This is the first record of a natural definitive host for B. ezohelicis. Although most of them were at the gravid adult stage, their body sizes varied widely. This species was described by using the specimens from experimentally infected mice. When compared with the original description, the crow-derived specimens were longer in total body length and has smaller testes and a wider uterine space, probably due to better development in the suitable host. The difference provides a cautionary tale about the plasticity of morphology in trematodes. Our finding strongly suggests that birds are more suitable than mammals in serving as definitive hosts for B. ezohelicis.

  • 長澤 和也, 石山 尚樹
    2021 年 50 巻 p. 11-19
    発行日: 2021/02/28
    公開日: 2021/02/28
    ジャーナル オープンアクセス

    The lernaeopodid copepod Salmincola markewitschi Shedko and Shedko, 2002 was collected in July 2019 from the buccal cavity of whitespotted char, Salvelinus leucomaenis (Pallas, 1814) (Salmonidae), reared at the Ishikawa Prefecture Fisheries Research Center (36°15′11″N, 136°25′17″E) in Kaga, Ishikawa Prefecture, central Japan. This represents the first record of Salmincola markewitschi from Ishikawa Prefecture. All of the four whitespotted char examined (263–324 mm standard length) were infected each by 2–5 adult females of Salmincola markewitschi. The adult female of copepod is described. The species is considered to have been introduced along with infected whitespotted char transported alive from a commercial trout farm in the same prefecture into the research center in January 2019. However, no infection was found after September 2019, which was caused by manual removal of copepods in July 2019 and their possible mortality due to unusually high water temperatures (up to 23℃) in August 2019. Since Salmincola markewitschi is morphologically similar to copepods previously reported as “Salmincola carpionis (Krøyer, 1837)” from salmonids (mainly chars Salvelinus spp.) from various localities of Japan, it is desirable to reidentify those copepods.

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