A new deepwater assfish, Bassozetus nielseni sp. nov., is described from 29 specimens [147–615 mm in standard length (SL)] collected from the North Atlantic and West Indian oceans. It is distinguished from 13 congeners by the following combination of characters: dorsal-fin rays 122–129, long rakers on first gill arch 11–14, oblique scales 20–25, abdominal vertebrae 13–14, head length 18.1–21.3 % SL, body depth at anal-fin origin 8.2–14.6 % SL, predorsal length 16.4–20.1 % SL, tail length 62.7–68.0 % SL, posterior tip of pelvic-fin rays anterior to anus, a single median basibranchial tooth patch, dorsal margin of sagittal otolith smooth, and fins pale yellowish brown (preserved condition).
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Alcock AW (1890) Natural history notes from H. M. Indian Marine survey steamer “Investigator”, Commander R. F. Hoskyn, R. N., commanding. –No 16. On the bathybial fishes collected in the Bay of Bengal during the season 1889–1890. Ann Mag Nat Hist Ser 6 6:197–222
Cohen DM, Nielsen JG (1978) Guide to the identification of genera of the fish order Ophidiiformes with a tentative classification of the order. NOAA Tech Rep NMFS Circ 417:1–72
Fricke R, Eschmeyer WN (2017) A guide to fish collections in the catalog of fish, electronic version, updated 31 August 2017. http://researcharchive.calacademy.org/research/ichthyology/catalog/collections.asp. Accessed 5 September 2017
Garman S (1899) Reports on an exploration off the west coast of Mexico, Central and South America, and off the Galapagos Islands, in charge of Alexander Agassiz, by the U.S. Commission steamer “Albatross”, during 1891. The fishes. Mem Mus Comp Zool Harv 24:1–431
Gill TN (1883) Diagnosis of new genera and species of deep-sea fish-like vertebrates. Proc US Natl Mus 6:253–260
Günther A (1878) Preliminary notice of deep-sea fishes collected during the voyage of H.M.S. Challenger. Ann Mag Nat Hist Ser 5 2:17–28, 179–187, 248–251
Günther A (1887) Report on the deep-sea fishes collected by H.M.S. Challenger during the years 1873–76. Rep Sci Res Voy H.M.S. Challenger during the years 1873–76. Zool 22:i–lxv + 1–335, 73 pls
Hubbs CL, Lagler KF (1958) Fishes of the Great Lakes region. Bull Cranbrook Inst Sci 26:1–213, 44 pls
Machida Y (1989) A new deep-sea ophidiid fish, Bassozetus levistomatus, from the Izu-Bonin Trench, Japan. Jpn J Ichthyol 36:87–189
Nielsen JG, Merrett NR (2000) Revision of the cosmopolitan deep-sea genus Bassozetus (Pisces: Ophidiidae) with two new species. Galathea Rep 18:7–56, 1 pl
Nielsen JG, Møller PR (2008) New and rare deep-sea ophidiiform fishes from the Solomon Sea caught by the Danish Galathea 3 Expedition. Steenstrupia 30:21–46
Nielsen JG, Cohen DM, Markle DF, Robins CR (1999) Ophidiiform fishes of the world (other Ophidiiformes). FAO species catalogue vol 18. FAO, Rome
Ohashi S, Shinohara G (2015) An additional record of Bassozetus levistomatus Machida 1989 from the western North Pacific (Teleostei, Ophidiiformes, Ophidiidae). Bull Natl Mus Nat Sci Ser A Zool 41:69–75
Radcliffe L (1913) Descriptions of seven new genera and thirty-one new species of fishes of the families Brotulidae and Carapidae from the Philippine Islands and the Dutch East Indies. Proc US Natl Mus 44:135–176
Rass TS (1955) Deepsea fishes of the Kurile-Kamchatka trench. Trud Inst Okeanol 12:328–339
Shcherbachev YN (1980) Preliminary review of deep-sea ophidiids (Ophidiidae, Ophidiiformes) of the Indian Ocean. Trud Inst Okeanol 110:105–176
Takami M, Tomiyama S, Fukui A (2011) First record of a deep-sea ophidiid fish, Bassozetus robustus, from Japan. Jpn J Ichthyol 58:177–180
Tomiyama S, Takami M, Fukui A (2011) First record of a deep-sea ophidiid fish, Bassozetus glutinosus, from Japan. Jpn J Ichthyol 58:93–97
Tomiyama S, Takami M, Fukui A (2015) Redescription of Bassozetus compressus (Günther 1878), a senior synonym of Bassozetus elongatus Smith and Radcliffe 1913 (Ophidiiformes: Ophidiidae). Ichthyol Res https://doi.org/10.1007/s10228-015-0491-6 (also appeared in Ichthyol Res 63:218–226)
Tomiyama S, Takami M, Fukui A (2016) A new deepwater assfish, Bassozetus mozambiquensis sp. nov. (Ophidiiformes: Ophidiidae), from the western Indian Ocean. Ichthyol Res https://doi.org/10.1007/s10228-016-0527-6 (also appeared in Ichthyol Res 64:13–17)
Vaillant LL (1888) Expéditions scientifiques du “Travailleur” et du “Talisman” pendant les années 1880, 1881, 1882, 1883. Poissons. G. Masson, Paris
We are most grateful to the following for specimen loans: P.-L. Lin (ASIZP), J. Maclaine and T. Heath (BMNH), H. Endo and N. Nakayama (BSKU), P. Pruvost, R. Casse and Z. Gobsi (MNHN), G. Shinohara (NSMT), D. Catania (CAS), J.T. Williams and S.J. Raredon (USNM), J.G. Nielsen and T. Menne (ZMUC) and E.J. Hilton (VIMS). We also thank J.G. Nielsen, W. Schwarzhans (Hamburg, Germany) and two anonymous reviewers for helpful comments and G. S. Hardy (Ngunguru, New Zealand) for his critical reading of the manuscript. This study was supported in part by a Grant-in-Aid for Promotion of Scientific Research (C) (no. 25450280) from the Ministry of Education, Culture, Sports, Science and Technology, Japan, to the third author (AF).
This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as FAD96391-83D7-4F60-BEDB-5061C8F23207.
This article was published as an Online First article on the online publication date shown on this page. The article should be cited by using the doi number.
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Tomiyama, S., Takami, M. & Fukui, A. A new deepwater assfish, Bassozetus nielseni sp. nov. (Ophidiiformes: Ophidiidae), from the North Atlantic and West Indian oceans. Ichthyol Res 65, 353–362 (2018). https://doi.org/10.1007/s10228-018-0620-0
- Bassozetus compressus
- Bassozetus elongatus
- New species
- Nielsen’s assfish
- Sexual dimorphism