著者

佐々木 瑞希 石名坂 豪 能勢 峰 浅川 満彦 中尾 稔

出版者

日本野生動物医学会

雑誌

日本野生動物医学会誌 (ISSN:13426133)

巻号頁・発行日

vol.24, no.3, pp.123-126, 2019-09-25 (Released:2019-11-25)

参考文献数

18

被引用文献数

2

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2015年9月北海道斜里町で捕獲されたエゾヒグマを剖検したところ小腸より大型の条虫を検出した。頭節の形態および生殖器の配置から,Dibothriocephalus属と思われた。虫体の一部からDNAを抽出し,核28S ribosomal RNA geneおよびミトコンドリアcytochrome c oxidase geneの一部を解析した。その結果,DNAデータベース上の日本海裂頭条虫のものとほぼ一致し,本種を日本海裂頭条虫と同定した。本症例は,エゾヒグマから検出された条虫を日本海裂頭条虫と同定した初めての報告である。

著者

脇 司 中尾 稔 佐々木 瑞希 髙野 剛史 池澤 広美 宮崎 晋介

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.52, pp.37-47, 2022-02-28 (Released:2022-03-01)

参考文献数

28

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From 2018 to 2021, land snail surveys were carried out from Okinawa to Hokkaido, Japan to find metacercariae of the trematode genus Brachylaima. When metacercariae were obtained from land snails, their morphologies were recorded and partial sequences of mitochondrial DNA (cox1) and nuclear 28S rDNA were determined for DNA barcoding. As a p-distance value of less than 1.8% was considered to be intraspecific variation for cox1 (630 bp) based on the sequences of known species of this genus, the metacercariae obtained in this study were discriminated into five putative species. Two of the five putative species were molecularly identified to two known species, B. lignieuhadrae and B. phaedusae, respectively, whereas the remaining three were treated as unidentified species. It is unknown whether the unidentified metacercariae were larvae of known species without genetic information or new species. Morphological and molecular comparisons of adults are necessary for the taxonomic clarification of these unidentified metacercariae.

著者

佐々木 瑞希 石名坂 豪 能勢 峰 浅川 満彦 中尾 稔

出版者

日本野生動物医学会

雑誌

日本野生動物医学会誌

巻号頁・発行日

vol.24, no.3, pp.123-126, 2019

---

2015年9月北海道斜里町で捕獲されたエゾヒグマを剖検したところ小腸より大型の条虫を検出した。頭節の形態および生殖器の配置から,Dibothriocephalus属と思われた。虫体の一部からDNAを抽出し,核28S ribosomal RNA geneおよびミトコンドリア cytochrome c oxidase geneの一部を解析した。その結果,DNAデータベース上の日本海裂頭条虫のものとほぼ一致し,本種を日本海裂頭条虫と同定した。本症例は,エゾヒグマから検出された条虫を日本海裂頭条虫と同定した初めての報告である。

著者

佐々木 瑞希 中尾 稔

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.50, pp.6-10, 2021-02-28 (Released:2021-02-28)

参考文献数

12

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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.

著者

佐々木 瑞希

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.54, pp.11-16, 2023-02-28 (Released:2023-03-07)

参考文献数

27

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Brachylaimoidea Joyeux and Foley, 1930 includes seven families, and most of them use terrestrial mollusks as intermediate hosts. Among them, trematodes of the genus Brachylaima Dujardin, 1843 (Brachylaimidae Joyeux and Foley, 1930) use terrestrial mollusks as both the first and second intermediate hosts. Nine species of Brachylaima have been reported in Japan, and five of them were recently described with their DNA barcodes based on the nuclear 28S ribosomal RNA and mitochondrial cytochrome c oxidase I gene. High specificity of each species to the first intermediate host suggests the diversity of trematodes of Brachylaima including undiscovered species. Panopistidae Yamaguti, 1958 is also a family of Brachylaimoidea, but its taxonomic position in the superfamily is uncertain, because the DNA barcodes of only one species were deposited. In addition, some genera such as Michajlovia Pojmańska, 1973, Urogonimus Monticelli, 1888, and Urotocus Looss, 1899 are treated as incertae sedis because of the lack of genetic data of related species. Additional sampling from the intermediate host snails and the final host and phylogenetic analyses are needed to solve the problems in the taxonomy of Brachylaimoidea.

著者

天池 庸介 増田 隆一 佐々木 瑞希 中尾 稔

出版者

北海道大学

雑誌

基盤研究(C)

巻号頁・発行日

2021-04-01

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近年、北海道において都市に定着するキツネ(“都市ギツネ”)の個体数が増加しており、キツネと野ネズミを宿主とする寄生虫エキノコックスのヒトへの感染リスク増加が懸念されている。そこで本研究では、都市部におけるエキノコックスの感染リスク評価とその伝播メカニズムの解明を目的として、都市ギツネと野ネズミを対象に生態遺伝学的および疫学的調査を実施し、個体群密度や分散パターン、地域毎のエキノコックス感染率などを明らかにする。本研究の成果は感染症予防対策の構築に寄与する。