[in Japanese]

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Nine genera and 22 species of Japanese Orthocentrinae were taxonomically and zoogeographically studied. The genus Apoclima Förster, 1869, and the subgenus Dicolus Förster, 1869 are newly recorded from Japan. Four new species, Apoclima brevicauda sp. nov., Apo. longicauda sp. nov., Hemiphanes japonicum sp. nov., and Proclitus tuberculatus sp. nov., were described. Eight species, Aniseres baikalensis Humala, 2007, H. gravator Förster, 1871, Megastylus (Dicolus) excubitor (Förster, 1871), M. (Dic.) impressor Schiødte, 1838, M. (Dic.) pectoralis (Förster, 1871), M. (Megastylus) kuslitzkii Humala, 2007, Pr. ganicus Sheng & Sun, 2013, and Pr. praetor (Haliday, 1838), were newly recorded from Japan. In addition, the ten Japanese species were additionally recorded from several localities of Japan.

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Libelloides ramburi is an endangered species whose distribution in Kanagawa Prefecture is currently limited to a corner of the northern part of the prefecture. In this study, I report the results of the ecological survey conducted in 2022. In 2022, I marked 367 adults of L. ramburi for individual identification, of which 37 individuals (10 %) were recaptured. The result was similar to that of the 2021’s survey. These suggest that adult members in the populations interchange rather frequently. The days to survive was as 15 (males) and 19 (females) days, respectively. The ratio of males was high in the early season, but it remarkably decreased towards the end of the survey. Thus, the marking methods are useful for the solution of population dynamics of this species.

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A single specimen of Pterygotrigla macrorhynchus Kamohara, 1936 (Perciformes: Triglidae) was collected from the Pacific coast off Ishinomaki, Miyagi Prefecture, Japan. This specimen is small (57.2 mm in standard length), and has a vertebral abnormality. It represents the northernmost record of this species.

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Two specimens (20.2 and 44.5 mm standard length) of a hogfish species Bodianus opercularis (Guichenot, 1847) (Labridae), previously considered endemic to the Indian Ocean including the Red and Arabian Seas, were collected from the Ogasawara Islands (Japan), West Pacific. The specimens, herein described in detail, represent the first specimen-based records of the species from the Pacific Ocean. A new standard Japanese name “Akashimatakibera” is proposed for the species, based on one of the specimens (KPM-NI 7936, 45.5 mm standard length). During this study, the previous distribution records of B. opercularis and Bodianus neopercularis Gomon, 2006, the latter considered an allopatric Western Pacific congener of B. opercularis, were re-assessed by re-identifying the individuals listed as previous records. Bodianus opercularis was found to be widely distributed in the following Indo-West Pacific locations: Red Sea, Arabian Sea, Kenya, Comoros, Madagascar, western Mascarene and Christmas Island (Indian Ocean); southern Japan and Marshall Islands (West Pacific Ocean). Reliable records of B. neopercularis were confirmed from only the Marshall Islands, West Pacific.

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