Ichthyological Research

, Volume 64, Issue 1, pp 13–17 | Cite as

A new deepwater assfish, Bassozetus mozambiquensis sp. nov. (Ophidiiformes: Ophidiidae), from the western Indian Ocean

  • Shinichi Tomiyama
  • Munehiro Takami
  • Atsushi Fukui
Full Paper


A new deepwater assfish, Bassozetus mozambiquensis sp. nov., is described from a single specimen (431 mm SL) collected from the western Indian Ocean. Originally identified as Bassozetus compressus (Günther 1878), it was subsequently found to be distinguishable from 12 valid species of the genus due to the following combination of characters: dorsal-fin rays 117; long rakers on first gill arch 14; oblique scales ca. 30; total vertebrae 65; pelvic-fin length 9.5 % of standard length; a single median basibranchial tooth patch; sagittal otolith lacking a small process on anterior margin, dorsal margin smooth, an ostial channel present.


Neobythitinae Bassozetus compressus Mozambique Channel Madagascar Benthopelagic 



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 and R. Casse (MNHN), G. Shinohara (NSMT), D. Catania (CAS), J.T. Williams and S.J. Raredon (USNM) and J. G. Nielsen (ZMUC) and E.J. Hilton (VIMS). We also thank 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.


  1. 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 Natl Hist Ser 6 6:197–222Google Scholar
  2. 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 417:1–72Google Scholar
  3. Fricke R, Eschmeyer WN (2016) A guide to fish collections in the catalog of fish electronic version. Updated 31 March 2016. Accessed 12 April 2016
  4. 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, bythe U.S. Commission steamer “Albatross,” during 1891. The fishes. Mem Mus Comp Zool Harvard 24:1–431Google Scholar
  5. Gill TN (1883) Diagnosis of new genera and species of deep-sea fish-like vertebrates. Proc US Natn Mus 6:253–260Google Scholar
  6. Günther A (1878) Preliminary notice of deep-sea fishes collected during the voyage of H.M.S. Challenger. Ann Mag Natl Hist Ser 5 2:17–28, 179–187, 248–251Google Scholar
  7. Günther A (1887) Report on the deep-sea fishes collected by H.M.S. Challenger during the years 1873–76. Rep Sci Res Challenger 22 (Zool):i–xv+1–335, 73 plsGoogle Scholar
  8. Hubbs CL, Lagler KF (1958) Fishes of the Great Lakes region. Bull Cranbrook Inst Sci 26:1–213, 44 plsGoogle Scholar
  9. Machida Y (1989) A new deep-sea ophidiid fish, Bassozetus levistomatus, from the Izu-Bonin Trench, Japan. Jpn J Ichthyol 36:87–189Google Scholar
  10. Machida Y, Ohta S (1990) Occurrence of the deep-sea ophidiid fish Eretmichthys pinnatus in the Pacific off Japan. Jpn J Ichthyol 37:314–317Google Scholar
  11. 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 plGoogle Scholar
  12. Nielsen JG, Møller PR (2008) New and rare deep-sea ophidiiform fishes from the Solomon Sea caught by the Danish Galathea 3 Expedition. Steenstrupia 30:21–46Google Scholar
  13. Nielsen JG, Cohen DM, Markle DF, Robins CR (1999) Ophidiiform fishes of the world (order Ophidiiformes). FAO species catalogue vol 18. FAO RomeGoogle Scholar
  14. 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 Natn Mus 44:135–176Google Scholar
  15. Rass TS (1955) Deep-sea fishes of the Kurile-Kamchatka trench. Trud Inst Okeanol 12:328–339Google Scholar
  16. Shcherbachev YN (1980) Preliminary review of deep-sea ophidiids (Ophidiidae, Ophidiiformes) of the Indian Ocean. Trud Inst Okeanol 110:105–176Google Scholar
  17. Takami M, Tomiyama S, Fukui A (2011) First record of a deep-sea ophidiid fish, Bassozetus robustus, from Japan. Jpn J Ichthyol 58:177–180Google Scholar
  18. Tomiyama S, Takami M, Fukui A (2011) First record of a deep-sea ophidiid fish, Bassozetus glutinosus, from Japan. Jpn J Ichthyol 58:93–97Google Scholar
  19. 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. doi: 10.1007/s10228-015-0491-6 (also appeared in Ichthyol Res 63:218–226)
  20. Vaillant LL (1888) Expéditions scientifiques du “Travailleur” et du “Talisman” pendant les années 1880, 1881, 1882, 1883. Poissons. G. Masson, ParisGoogle Scholar

Copyright information

© The Ichthyological Society of Japan 2016

Authors and Affiliations

  • Shinichi Tomiyama
    • 1
  • Munehiro Takami
    • 2
  • Atsushi Fukui
    • 2
  1. 1.Marine Science MuseumTokai UniversityShizuokaJapan
  2. 2.School of Marine Science and TechnologyTokai UniversityShizuokaJapan

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