著者

Homma Riko Uyeno Daisuke Kakui Keiichi

出版者

Elsevier

雑誌

Parasitology International (ISSN:13835769)

巻号頁・発行日

vol.78, pp.102135, 2020-10

被引用文献数

4

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Based on specimens from the gill cavities of one Platichthys stellatus individual collected in the Sea of Japan, we investigated the taxonomic status of the enigmatic caligid genus Pseudolepeophtheirus and its type species, Pseudolepeophtheirus longicauda. In a maximum likelihood (ML) tree based on 18S rRNA gene sequences, the sequence from our sample was nested in a well-supported Lepeophtheirus clade, along with the type species, confirming that Pseudolepeophtheirus should be considered a junior synonym of Lepeophtheirus; our morphological data support this synonymy. Although a previous study had synonymized Pseudolepeophtheirus longicauda with Lepeophtheirus parvicruris, we found that the former differs morphologically from the latter in having a short leg-4 exopod, with the articulation between the first and second segments not evident (the shape of the posterior striated membrane on the leg-2 intercoxal sclerite also differs between two species), and detected slight differences in 18S rRNA sequences between two taxa. We thus concluded that this synonymy is invalid, and reinstate Lepeophtheirus longicauda as a valid species. A ML analysis of COI sequences from Pl. stellatus (the host fish for both L. longicauda and L. parvicruris) showed the host species to comprise distinct northwestern- and northeastern-Pacific clades. Lepeophtheirus longicauda is distributed in the northwestern Pacific and L. parvicruris in the northeastern Pacific, indicating co-divergence of the two copepod species with the host lineages.

著者

木村 妙子 木村 昭一 自見 直人 角井 敬知 冨岡 森理 大矢 佑基 松本 裕 田邊 優航 長谷川 尚弘 波々伯部 夏美 本間 理子 細田 悠史 藤本 心太 倉持 利明 藤田 敏彦 小川 晟人 小林 格 石田 吉明 田中 颯 大西 はるか 締次 美穂 吉川 晟弘 田中 正敦 櫛田 優花 前川 陽一 中村 亨 奥村 順哉 田中 香月 Kimura Taeko Kimura Shoichi Jimi Naoto Kakui Keiichi Tomioka Shinri Oya Yuki Matsumoto Yu Tanabe Yuki Hasegawa Naohiro Hookabe Natsumi Homma Riko Hosoda Yushi Fujimoto Shinta Kuramochi Toshiaki Fujita Toshihiko Ogawa Akito Kobayashi Itaru Ishida Yoshiaki Tanaka Hayate Onishi Haruka Shimetsugu Miho Yoshikawa Akihiro Tanaka Masaatsu Kushida Yuka Maekawa Yoichi Nakamura Toru Okumura Junya Tanaka Kazuki

出版者

三重大学大学院生物資源学研究科

雑誌

三重大学フィールド研究・技術年報 = Annals of Field Research and Technology Mie University (ISSN:13496824)

巻号頁・発行日

vol.16, pp.1-32, 2018-10

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In this study, we had investigated the benthic deep-sea fauna using the dredge and beam trawl in the region from the continental shelf to the continental slope of the Sea of Kumano, Mie Prefecture, during the No.1722 research voyage of the training ship Seisui-Maru of Mie University. The survey was carried out at 16 stations covering a depth range of 113-1059 m. The results of the survey, 14 phyla had been confirmed. Arthropod, echinoderm, annelid and molluscan macrobenthos were collected from all of the stations. The phylum number of each station was in the range from 4 to 11. The largest number of phyla had been confi rmed at St.10D of boulders bottom(768-800 m depth). Meiobenthos confi rmed in our sample were kinorhynchs, nematodes, tardigrades, loriciferans and small arthropods such as tanaidaceans, copepods and cumaceans. In addition to free-living species, parasitic copepods, isopods, platyhelminthes, acanthocephalans and nematodes had been found in fish, crustaceans and polychaetes.