On the systematics of three eelpout species (Teleostei: Zoarcidae: Lycodes) endemic to the Sea of Okhotsk

M.V. Nazarkin, N.Yu. Ivanova & G. Shinohara

Abstract. Three nominal species of eelpouts endemic to the Sea of Okhotsk, specifically Lycodes ygreknotatus Schmidt in Taranetz, 1937, L. microlepidotus Schmidt, 1950, and L. fulvus Toyoshima, 1985, are reinvestigated based on all type materials and additional specimens. The latter two species are recognised as junior synonyms of L. ygreknotatus, as no significant morphological differences were found among these taxa. Lycodes ygreknotatus is rediagnosed. It exhibits significant geographic variability in both the number of vertebrae and the density of scale cover. The observed variability can likely be attributed to differences in environmental temperatures across different parts of its extensive distribution range.

Key words: Sea of Okhotsk, synonymy, redescription, distribution, eelpouts, Lycodes

Zoosystematica Rossica, 2024, 33(1): 116–129 ▪ Published online 11 July 2024

https://doi.org/10.31610/zsr/2024.33.1.116 ▪ Open full article

References

Anderson M.E. 1994. Systematics and osteology of the Zoarcidae (Teleostei: Perciformes). Ichthyological Bulletin of J.L.B. Smith Institute of Ichthyology, 60: 1–120.

Andriyashev A.P. 1954. Ryby severnykh morei SSSR [Fishes of the Northern Seas of the USSR]. Moscow: Nauka. 567 p. (In Russian).

Balanov A.A., Zemnukhov V.V. & Ivanov O.A. 2004. Distribution of the eelpout Lycodes soldatovi (Pisces: Zoarcidae) over the Continental Slope of the Sea of Okhotsk. Russian Journal of Marine Biology, 30(4): 248–258. https://doi.org/10.1023/B:RUMB.0000039155.99140.22

Borets L.A. 1997. Donnye ikhtiotseny rossiyskogo shel’fa dal’nevostochnykh morey: sostav, struktura, elementy funktsionirovaniya i promyslovoe znachenie [Bottom ichtyocenoses of the shelf of Russian Far East seas: composition, structure, functioning, and commercial value]. Vladivostok: TINRO-tsentr. 217 p. (In Russian).

Fedorov V.V., Chereshnev I.A., Nazarkin M.V., Shestakov A.V. & Volobuev V.V. 2003. Katalog morskikh i presnovodnykh ryb severnoy chasti Okhotskogo morya [Catalog of marine and freshwater fishes of the northern part of the Sea of Okhotsk]. Vladivostok: Dal’nauka. 204 p. (In Russian).

Froese R. & Pauly D. (Eds). 2023. Scientific names where genus equals Lycodes. FishBase. World Wide Web electronic publication [online]. https://www.fishbase.se/Nomenclature... [updated 23 June 2010; viewed 29 May 2023].

Garrett D.L., Pietsch T.W., Utter F.M., & Hauser L. 2007. The hybrid sole Inopsetta ischyra (Teleostei: Pleuronectiformes: Pleuronectidae): hybrid or biological species? Transactions of the American Fisheries Society, 136: 460–468. https://doi.org/10.1577/T06-092.1

Glukhovsky B.H., Goptarev N.P., & Terziev F.S. (Eds.). 1998. Gidrologiya i gidrokhimiya morey, 9(1). Okhotskoe more. Gidrometeorologicheskie usloviya [Hydrology and hydrochemistry of the Seas, 9(1). Sea of Okhotsk. Hydrometeorological conditions]. St Petersburg: Hydrometeoizdat. 343 p. (In Russian).

Hatooka K. 2002. 287. Zoarcidae eelpouts. In: Nakabo T. (Ed.). Fishes of Japan with pictorial keys to the species: 1028–1044, 1581–1583. Tokyo: Tokai University Press.

Hubbs C.L. 1955. Hybridization between Fish Species in Nature. Systematic Zoology, 4: 1–20. https://doi.org/10.2307/sysbio/4.1.1

Jordan D.S. 1891. Relations of temperature to vertebrae among fishes. Proceedings of the United States National Museum, 14: 107–120. https://doi.org/10.5479/si.00963801.14-845.107

Lindberg G.U. & Krasyukova Z.V. 1975. Ryby Yaponskogo morya i prilegauschikh chastey Okhotskogo i Zheltogo morey [Fishes of the Sea of Japan and adjacent parts of the Sea of Okhotsk and the Yellow Sea], 4. Teleostomi. XXIX. Perciformes. 2. Blennioidei – 13. Gobioidei (CXLV. Anarhichadidae – CLXXV. Periophthalmidae). Leningrad: Nauka. 463 p. (In Russian).

Mecklenburg C.W., Mecklenburg T.A., Sheiko B.A. & Steinke D. 2016. Pacific Arctic marine fishes. Akureyri: Conservation of Arctic Flora and Fauna. 398 p.

Møller P.R., Nielsen J.G., Knudsen S.W., Poulsen J.Y., Sünksen K. &Jørgensen O.A. 2010. A checklist of the fish fauna of Greenland waters. Zootaxa, 2378: 1–84. https://doi.org/10.11646/zootaxa.2378.1.1

Møller P.R. & Gravlund P. 2003. Phylogeny of the eelpout genus Lycodes(Pisces, Zoarcidae) as inferred from mitochondrial cytochrome b and 12S rDNA. Molecular Phylogenetics and Evolution, 26: 369–388. https://doi.org/10.1016/S1055-7903(02)00362-7

Nazarkin M.V. 2010. On the identity of two species of eelpouts (Pisces: Zoarcidae) from the Sea of Okhotsk. Journal of Ichthyology, 50: 1–11. https://doi.org/10.1134/S0032945210010017

Nazarkin M.V. & Shinohara G. 2012. Taxonomy of Lycodes matsubarai Toyoshima, 1985 and Lycodes yamatoi Toyoshima, 1985 (Perciformes, Zoarcidae). Bulletin of the National Museum of Nature and Science. Series A, 38(1): 33–47.

Nazarkin M.V., Shinohara G. & Shirai S.M. 2014. Phylogeny and taxonomy of Petroschmidtia teraoi (Katayama, 1943) (Osteichthyes: Perciformes: Zoarcidae). Zootaxa, 3780(1): 171–193. https://doi.org/10.11646/zootaxa.3780.1.7

Nishimura S. 1974. Nihon-kai no seiritsu [Formation of the Sea of Japan]. Tokyo: Tsukiji-Shokan. 227 p. (In Japanese).

Radchenko O.A. 2017. Molekulyarnaya sistematika i filogeniya bel’dyugovidnykh ryb [Molecular systematics and phylogeny of zoarcoid fishes]. Moscow: GEOS. 384 p. (In Russian).

Schmidt J. 1920. Racial studies in fishes. IV. Experimental investigations with Zoarces viviparus L. Journal of Genetics, 10: 179–91. https://doi.org/10.1007/BF03007980

Schmidt P.Yu. 1904. Ryby vostochnykh morey Rossiyskoy Imperii [Fishes of the eastern Seas of the Russian Empire]. St Petersburg. 466 p. (In Russian).

Schmidt P.Yu. 1950. Ryby Okhotskogo morya [Fishes of the Sea of Okhotsk]. Moscow – Leningrad: Publishing House of the USSR Academy of Sciences. 370 p. (In Russian).

Taranetz A.Ya. 1937. Brief identification key to fish species of the Soviet Far East and adjacent waters. Izvestiya TINRO, 11: 1–200. (In Russian).

Toyoshima M. 1985. Taxonomy of the subfamily Lycodinae (family Zoarcidae) in Japan and adjacent waters. Memoirs of the Faculty of Fisheries, Hokkaido University, 32: 131–243.

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