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Plectranthias ryukyuensis, a new species of perchlet from the Ryukyu Islands, Japan, with a key to the Japanese species of Plectranthias (Serranidae: Anthiadinae)


A new perchlet, Plectranthias ryukyuensis, is described on the basis of four specimens (41.2–61.6 mm standard length: SL) from the Okinawa Islands, Japan. Plectranthias ryukyuensis can be distinguished from all congeners by the following combination of characters: X, 15 or 16 dorsal-fin rays; 14 pectoral-fin rays, all unbranched; lateral line complete, with 29 or 30 pored scales; 3 scale rows above lateral line; 5 or 6 diagonal rows of large scales on cheek between eye and corner of preopercle; preopercle with two antrorse spines on ventral margin, 20–29 serrae on posterior margin; margins of subopercle and interopercle with a few serrae (weak in large individuals); minute flaps at tips of first to ninth dorsal-fin spines; caudal fin shallowly emarginate, with some ray branches distinctively elongated past fin margin; fourth dorsal-fin spine longest, its length 110.6–128.6% that of third spine; body pinkish-white with two longitudinal rows of irregular orange-red blotches on upper half of lateral surface when fresh (rows close together in smaller than ca. 50 mm SL), blotches interconnecting anteriorly on upper and lower rows, and posterior half of lower row; four faint orange-red vertical bands below lateral line on posterior half of body and two distinct yellow blotches on cheek in fresh specimens; body uniformly yellowish-brown with two longitudinal rows of irregular dark blotches on upper half of lateral surface in preserved specimens (faint in small specimens). A key to the Japanese species of Plectranthias is given.

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  • Ahlstrom EH, Butler JL, Sumida BY (1976) Pelagic stromateoid fishes (Pisces, Perciformes) of the eastern Pacific: kinds, distributions, and early life histories and observations on five of these from the northwest Atlantic. Bull Mar Sci 26:285–402

    Google Scholar 

  • Allen GR, Walsh F (2015) Plectranthias bennetti, a new species of anthiine fish (Pisces: Serranidae) from the Coral Sea, Australia. J Ocean Sci Found 16:82–89

    Google Scholar 

  • Anderson WD Jr (2008) A new species of the perciform fish genus Plectranthias (Serranidae: Anthiinae) from the Nazca Ridge in the eastern South Pacific. Proc Biol Soc Wash 121:429–43

    Article  Google Scholar 

  • Anderson WD Jr, Randall JE (1991) A new species of the anthiine genus Plectranthias (Pisces: Serranidae) from the Sala y Gómez Ridge in the eastern South Pacific, with comments on P. exsul. Proc Biol Soc Wash 104:335–343

    Google Scholar 

  • Bineesh KK, Akhilesh KV, Gopalakrishnan A, Jena JK (2014) Plectranthias alcocki, a new anthiine fish species (Perciformes: Serranidae) from the Arabian Sea, off southwest India. Zootaxa 3785:490–496

    CAS  Article  Google Scholar 

  • Bleeker P (1873) Sur les espèces indo-archipélagiques d’Odontanthias et de Pseudopriacanthus. Ned Tijdschr Dierk 4:235–240

    Google Scholar 

  • Chen J-P and Shao K-T (2002) Plectranthias sheni, a new species and P. kamii, a new record of anthiine fishes (Perciformes: Serranidae) from Taiwan. Zool Stud 41:63–68

    CAS  Google Scholar 

  • Fricke R, Eschmeyer WN, van der Laan R (eds) (2019) Catalog of fishes: genera, species, references. Accessed 12 November 2019

  • Fujiwara K, Tashiro S, Takayama M, Senou H, Motomura H (2017) Records of the anthiine fish Plectranthias sheni from Japan and proposal of new standard Japanese name. Jpn J Ichthyol 64:121–129

    Google Scholar 

  • Gill AC, Tea Y-K, Senou H (2016) Plectranthias takasei, new species of anthiadine fish from southern Japan (Teleostei: Serranidae). Zootaxa 4205:349–356

    Article  Google Scholar 

  • Gloerfelt-Tarp T, Kailola PJ (1984) Trawled fishes of southern Indonesia and northwestern Australia. Australian Development Assistance Bureau (ADAB), Directorate General of Fisheries, Indonesia (DGF), and German Agency for Technical Cooperation (GTZ), Jakarta

  • Heemstra PC, Randall JE (2009) A review of the anthiine fish genus Plectranthias (Perciforms: Serranidae) of the western Indian Ocean, with description of a new species, and a key to the species. Smithiana Bull 10:3–17

    Google Scholar 

  • Iwamoto T, McCosker JE (2014) Deep-water fishes of the 2011 Hearst Philippine biodiversity expedition by the California Academy of Sciences. In: Williams GC, Gosliner TM (eds) The Coral Triangle. The 2011 Hearst Philippine Biodiversity Expedition. California Academy of Sciences, San Francisco, pp 263–332

  • Johnson GD, Patterson C (2001) The intermuscular system of acanthomorph fishes: a commentary. Am Mus Novit 3312:1–24

    Article  Google Scholar 

  • Jordan DS, Richardson RE (1910) A review of the Serranidae or sea bass of Japan. Proc US Nat Mus 37:421–474

    Article  Google Scholar 

  • Katayama M (1964) A new genus and species of anthinid fish from Sagami Bay, Japan. Bull Fac Educ Yamaguchi Univ 13: 27–33

    Google Scholar 

  • Katayama M (1984) Plectranthias sagamiensis. In: Masuda H, Amaoka K, Araga C, Uyeno T, Yoshino T (eds) The Fishes of the Japanese Archipelago. Tokai University Press, Tokyo, p 134, pl 120-G

  • Katayama M, Masuda H (1980) Two new anthiine fishes from Sagami Bay, Japan. Jpn J Ichthyol 27:185–190

    Google Scholar 

  • Kawaji Y, Senou H, Muto N, Motomura H (2019) Records of three anthiadine species, Plectranthias longimanus, P. nanus, and P. winniensis, from Japanese waters, with morphological and genetic comparisons (Perciformes: Serranidae). Jpn J Ichthyol 66:137–154

    Google Scholar 

  • Koeda K, Maekawa T, Wada H, Motomura H (2016) Records of the Orange Goatfish, Mulloidichthys pflugeri (Teleostei: Mullidae), from Amami-oshima and Yonaguni-jima islands in the Ryukyu Archipelago, southern Japan. South Pac Stud 37:1–8

    Google Scholar 

  • Matsunuma M, Okamoto M, Yamakawa T, Endo M (2017) First records of Plectranthias xanthomaculatus (Serranidae: Anthiinae) from Okinawa and Kochi prefectures, southern Japan, with notes on ontogenetic morphological changes. Jpn J Ichthyol 64:185–189

    Google Scholar 

  • Okamoto M, Hoshimo K, Kogure Y (2012) First record of the anthiine fish Plectranthias elongatus from the East China Sea, Japan. Jpn J Ichthyol 59:55–60

    Google Scholar 

  • Okamoto M, Motomura H (2017) First Japanese record of the anthiine fish Plectranthias xanthomaculatus from west of the Amami Islands, East China Sea. Bull biogeogr Soc Jpn 71:47–52

    Google Scholar 

  • Patterson C, Johnson GD (1995) The intermuscular bones and ligaments of teleostean fishes. Smithson Contrib Zool 559:1–83

    Article  Google Scholar 

  • Randall JE (1980) Revision of the fish genus Plectranthias (Serranidae: Anthiinae) with descriptions of 13 new species. Micronesica 16:101–187

    Google Scholar 

  • Randall JE (1996) Two new anthiine fishes of the genus Plectranthias (Perciformes: Serranidae), with a key to the species. Micronesica 29:113–131

    Google Scholar 

  • Randall JE, Hoese DF (1995) Three new species of Australian fishes of the genus Plectranthias (Serranidae: Anthiinae). Rec Aust Mus 47:327–335

    Article  Google Scholar 

  • Randall JE, Shimizu T (1994) Plectranthias pelicieri, a new anthiine fish (Perciformes: Serranidae) from Mauritius, with notes on P. gardineri. Jpn J Ichthyol 41:109–115

    Google Scholar 

  • Sabaj MH (2019) Standard symbolic codes for institutional resource collections in herpetology and ichthyology: an online reference. Version 7.1 (21 March 2019). American Society of Ichthyologists and Herpetologists, Washington, DC. Accessed 12 November 2019

  • Senou H (1993) Serranidae. In: Nakabo T (ed) Fishes from Japan with pictorial keys to the species. Tokai University Press, Tokyo, pp 601–632, 1306–1312

  • Senou H (2000) Serranidae. In: Nakabo T (ed) Fishes from Japan with pictorial keys to the species. 2nd edition. Tokai University Press, Tokyo, pp 690–731, 1539–1547

  • Senou H (2002) Serranidae. In: Nakabo T (ed) Fishes from Japan with pictorial keys to the species. English edition. Tokai University Press, Tokyo, pp 690–731, 1532–1540

  • Senou H (2013) Serranidae. In: Nakabo T (ed) Fishes from Japan with pictorial keys to the species. 3rd edition. Tokai University Press, Hadano, pp 757–802, 1960–1971

  • Senou H (2014) Plectranthias wheeleri. In: Motomura H, Matsuura K (eds) Field guide to fishes of Yoron Island in the middle of the Ryukyu Islands, Japan. The Kagoshima University Museum, Kagoshima and the National Museum of Nature and Science, Tsukuba, pp 160–161

    Google Scholar 

  • Shepherd B, Phelps T, Pinheiro HT, Pérez-Matus A, Rocha LA (2018) Plectranthias ahiahiata, a new species of perchlet from a mesophotic ecosystem at Rapa Nui (Easter Island) (Teleostei, Serranidae, Anthiadinae). ZooKeys 762:105–116

    Article  Google Scholar 

  • Steindachner F (1883) Beiträge zur Kenntniss der Fische Japans (I.). Anz Akad Wiss Wien 20:49–50

    Google Scholar 

  • Steindachner F (1900) Fische aus dem Stillen Ocean. Ergebnisse einer Reise nach dem Pacific (Schauinsland, 1896–1897). Anz Akad Wiss Wien 16:174–178

    Google Scholar 

  • Tashiro S, Motomura H (2017) First Japanese record of the Barred Perchlet Plectranthias fourmanoiri (Actinopterygii: Perciformes: Serranidae) from the Ryukyu Islands. Species Divers 22:81–85

    Article  Google Scholar 

  • Tyler JC (1966) A new species of serranoid fish of the family Anthidae from the Indian Ocean. Not Nat 389:1–6

    Google Scholar 

  • Wada H, Senou H, Motomura H (2018) Plectranthias maekawa, a new species of perchlet from the Tokara Islands, Kagoshima, Japan, with a review of Japanese records of P. wheeleri (Serranidae: Anthiadinae). Ichthyol Res. (also appeared in Ichthyol Res 66:269–279)

  • Weber M (1913) Die fishce der Siboga-Expedition. E. J. Brill, Leiden.

    Google Scholar 

  • Williams JT, Delrieu-Trottin E, Planes S (2013) Two new fish species of the subfamily Anthiinae (Perciformes, Serranidae) from the Marquesas. Zootaxa 3647:167–180

    Article  Google Scholar 

  • Wu K-Y, Randall JE, Chen J-P (2011) Two new species of anthiine fishes of the genus Plectranthias (Perciformes: Serranidae) from Taiwan. Zool Stud 50:247–253

    Google Scholar 

  • Yoshino T (1972) Plectranthias yamakawai, a new anthiine fish from Ryukyu Islands, with a revision of the genus Plectranthias. Jpn J Ichthyol 19:49–56

    Google Scholar 

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We are especially grateful to K. Abe (Cube International Co., Ltd.), who collected the type specimens of the present new species. A. Kaneko (OCF), A. Mishiku (Okinawa, Japan) and T. Hashimoto (Osaka, Japan) took photographs of live individuals, the crew of the FV Daikoku-maru, FV Matsuyoshi-maru, RV Yoko-maru, and RV Nagasaki-maru, Tosashimizu Fisheries Guidance Station, M. Okamoto, T. Yoshida, S. Tashiro (Seikai National Fisheries Research Institute), M. Yamada (Kagoshima City Aquarium), T. Maekawa and F. Maekawa (Maekawa Fisheries Co., Ltd., Amami), M. Matsunuma (Kindai University), D. Uyeno (Kagoshima University), N. Hanzawa (Yamaguchi University), M. Fujimoto (Hiroshima University), Y. Sakurai (Okinawa, Japan), M. Takayama, G. Ogihara, M. Yamashita, Y. Ohashi, K. Wibowo, K. Fujiwara, and K. Kawama (KAUM) collected comparative materials, and S. Kimura (FRLM), K. Matsuura, G. Shinohara, H. Namikawa, M. Nakae, and K. Kuriiwa (NSMT), and K. Miyamoto (OCF) provided opportunities to examine specimens of Plectranthias. J. Nakamura (KAUM) gave valuable comments on the manuscript, two anonymous referees for reading the manuscript and providing valuable comments, and G. Hardy (Ngunguru, New Zealand) read the manuscript and provided help with English. The curatorial assistance of Y. Haraguchi, and other volunteers and members of the Laboratory of Fish Systematics (KAUM) is also gratefully acknowledged. This study was supported in part by JSPS KAKENHI Grant Numbers JP19770067, JP26241027, JP24370041, JP23580259, JP26450265; the JSPS Core-to-Core Program: B Asia-Africa Science Platforms; the “Biological Properties of Biodiversity Hotspots in Japan” project of the National Museum of Nature and Science, Tsukuba, Japan; “Establishment of Research and Education Network on Biodiversity and Its Conservation in the Satsunan Islands” project of Kagoshima University adopted by the Ministry of Education, Culture, Sports, Science and Technology, Japan; and the “Island Research” project of Kagoshima University.

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Correspondence to Hidetoshi Wada.

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Wada, H., Suzuki, T., Senou, H. et al. Plectranthias ryukyuensis, a new species of perchlet from the Ryukyu Islands, Japan, with a key to the Japanese species of Plectranthias (Serranidae: Anthiadinae). Ichthyol Res 67, 294–307 (2020).

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  • Plectranthias sagamiensis
  • Coloration
  • Taxonomy
  • Morphology
  • Description