宿主 Host

コイ Cyprinus carpio Linnaeus, 1758 [1–10]．

寄生部位 Site of infection

鰓 gills [1–10]．

産地 Localities

広島県 Hiroshima Pref. (広島県淡水魚指導所，庄原市 Hiroshima Prefectural Freshwater Fish Experiment Station, Shōbara city [1, 2]；広島大学水畜産学部，福山市  Faculty of Fisheries and Animal Husbandry, Hiroshima University Fukuyama city [1]；三原市 Mihara City)，長野県 Nagano Pref. [3]，静岡県 Shizuoka Pref. [3]，北海道 Hokkaidō（塘路湖 L. Tōro）[4, 6]，滋賀県 Shiga Pref.（琵琶湖 L. Biwa）[5]，沖縄県 Okinawa Pref.（比謝川 Hija R. [7]；安里又川 Asatomata River [8]），三重県 Mie Pref.（水産技術研究所玉城庁舎 Tamaki Field Station, Fisheries Technology Institute）[9]，東京都 Tōkyō Met. (天神濠 Tenjinbori)　[10]． 

環境 Environment

淡水 freshwater．

文献 References

[1] 今田良造・室賀清邦・平林重正 (1975). 養殖ゴイに寄生していた単世代吸虫 Dactylogyrus extensus. 日本水産学会誌 42: 153–158. (Imada, R., Muroga, K. and Hirabayashi, S. (1975). Dactylogyrus extensus (Monogenoidea) from cultured carp in Japan. Bulletin of the Japanese Society of Scientifc Fisheries 42: 153–158. [In Japanese with English abstract])

[2] 中津川俊雄･室賀清邦 (1977). 養殖ゴイにおける Dactylogyrus extensus 及び D. minutus の寄生率の季節的変化. 魚病研究 12: 99–104. (Nakatsugawa, T and Muroga, K. (1977). Seasonal changes in abundance of Dactylogyrus extensus and D. minutus (Monogenea) on cultured carp. Fish Pathology 12: 99–104. [In Japanese with English abstract].)

[3] Ogawa, K. and Egusa, S. (1979b). Redescription of Dactylogyrus extensus (Monogenea: Dactylogyridae) with a special reference to its male terminalia. Japanese Journal of Parasitology 28: 121–124.

[4] Nagasawa, K., Awakura, T. and Urawa, S.  (1989). A checklist and bibliography of parasites of freshwater fishes of Hokkaido. Scientific Reports of the Hokkaido Fish Hatchery 44: 1–49.

[5] Ogawa, K. and Egusa, S. (1982). Eight Species of Dactylogyrus (Monogenea, Dactylogyridae) from carp Cyprinus carpio in Japan with a proposal of two new species. Parazitologia 2: 95–101 [In Russian with English abstract].

[6] Ogawa, K. (1994b). Monogenean parasites of freshwater fishes of Hokkaido, Japan. Scientific Reports of the Hokkaido Fish Hatchery 48: 59–67.

[7] Nitta, M. and Nagasawa, K. (2015c). First record of a gill parasite, Dactylogyrus extensus (Monogenea: Dactylogyridae) co-introduced with common carp into Okinawa-jima Island, southern Japan. Fauna Ryukyuana 26: 1–4.

[8] Nitta, M. and Nagasawa, K. (2018b). An annotated checklist of the monogeneans (Platyhelminthes) reported from Okinawa Prefecture, southern Japan (1936–2017), with four new Japanese records and one new prefectural record for fish monogeneans. Fauna Ryukyuana: 46: 11–34. 

[9]  Nitta, M. (2023). New records of monogeneans, Gyrodactylus cyprini (Gyrodactylidae) and Dactylogyrus extensus (Dactylogyridae), parasitic on reared common carp Cyprinus carpio (Cypriniformes: Cyprinidae) in Mie Prefecture, Japan.  Species Diversity 28(2): 273–284.

[10] 倉持利明・佐田直也・髙野剛史・脇 司・巖城 隆・小川和夫 (2026). 皇居における寄生生物相（寄生蠕虫類，ダニ類，甲殻類）の研究. 国立科学博物館専報 54: 363–385.  (Kuramochi, T., Sata, N., Takano, T., Waki, T., Iwaki, T., & Ogawa, K. (2026). Surveys on parasite fauna (Helminths, Acarids and Crustaceans) in the Imperial Palace, Tokyo. Memoirs of the National Museum of Nature and Science  54: 363–385. [In Japanese with English abstract])

備考 Remarks

沖縄県からの記録は，コイの移入に伴い侵入したものと考えられている [7].

Dactylogyrus extensus recorded from Okinawa Prefecture was considered to be co-introduced with the host Cyprinus carpio [7].

和名は横山・長澤 (2014) で提唱された.

文献 Reference

横山 博・長澤和也 2014. 養殖魚介類の寄生虫の標準和名目録. 生物圏科学：広島大学大学院生物圏科学研究科紀要 53: 73–97.