Plectranthias kojii sp. nov. (Perciformes: Serranidae) is described from a single specimen [49.4 mm in standard length (SL)] collected from 150 m depth off Hamahiga-jima Island, near Okinawa-jima Island, Japan. Although the new species is most similar to Plectranthias ryukyuensis Wada, Suzuki, Senou and Motomura 2020, morphological characteristics and DNA barcoding of the former clearly differed from those of congeners. Plectranthias kojii is distinguished from P. ryukyuensis by the following combination of characters: 12 or 13 pectoral-fin rays; 10 scale rows below the lateral line; 2 supraneurals, small head (length 42.5% SL) with rounded upper profile; slightly convex in postorbital region; small eye (diameter 11.9% SL); the anterodorsal margin not protruding above the dorsal head profile; caudal fin slightly convex; fourth dorsal-fin spine long (length 20.0% SL); pre-pelvic-fin short (length 34.8% SL); pectoral fin short (length 37.0% SL); pelvic-fin spine long (length 19.6% SL); body with an arched orange band from bases of 7th to 9th dorsal-fin spines to middle of caudal-fin base; and yellowish-orange spots and blotches on the snout, cheek, jaws, nape, and spinous portion of the dorsal fin.
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We are especially grateful to Abe, K. (Cube International) and Wada, K. (Aquarium Factory Blue Harbor) for collecting and providing the specimen, together with photographs. We also thank Senou, H. (KPM), Motomura, H. (KAUM), and Miyamoto, K. and Hanahara, N. (OCF) for loaning the specimens and providing the tissue samples, Endo, H. and Sato, M. (Kochi University) for their support for taking X-ray of holotype, Aizawa, M., Sakamoto, K. and Ueshima, R. (ZUMT) for their curatorial assistant, and Fukada, J. (KBF), Hashimoto, A. (Stella Chemifa Corporation), and Mezaki, T., Toshino, S., Koido, T., Kitamura, T., Yamashita, K., and Nagaoka, C. (KBF) for their support during this research. Hardy, G.S. (Ngunguru, New Zealand) kindly improved the English in the manuscript. This study was supported in part by the Japan Fund for Global Environment of the Environmental Restoration and Conservation Agency, JSPS KAKENHI 21K06313 JP and the Sasakawa Scientific Research Grant from The Japan Science Society for the first author, and a Grant-in-Aid from the Japan Society for the Promotion of Science for JSPS Fellows (PD: 21J01755) for the last author.
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Koeda, K., Muto, N. & Wada, H. Plectranthias kojii sp. nov., a new perchlet (Perciformes: Serranidae: Anthiinae) from Okinawa, Japan. Ichthyol Res (2021). https://doi.org/10.1007/s10228-021-00842-1
- Plectranthias ryukyuensis
- New species
- Ryukyu Archipelago