Ichthyological Research

, Volume 62, Issue 4, pp 504–511 | Cite as

A new grenadier of the genus Hymenocephalus from Tosa Bay, southern Japan (Actinopterygii: Gadiformes: Macrouridae)

  • Naohide Nakayama
  • Hiromitsu Endo
  • Werner Schwarzhans
Full Paper


Hymenocephalus yamasakiorum, a new species of grenadier fishes, is described from a single specimen collected from Tosa Bay off Aki, Kochi, Japan, at a depth of 320–400 m. The species is distinguished from its 26 known congeners in having the following combination of features: pelvic-fin rays nine; pectoral-fin rays i16–i17; first dorsal-fin rays II, 10; chin barbel 55 % of head length (HL), its tip extending beyond the hind margin of orbit when laid back; snout moderately high, not depressed, length 28 % HL; orbit diameter 33 % HL; interorbital width 24 % HL; gill rakers on first arch (outer/inner) 14/20, on second arch 20/19; pyloric caeca 15; dorsal half of posterior part of tail prominently blackish.


New species Kochi Northwestern Pacific Otoliths 



Our sincere thanks go to the captain and crew of F/V Kosei-maru and the staff of the Mimase fish market. We are grateful to Ryu Asaoka, Ryo Misawa, Taiga Naito, Kosei Ajisaka, and other BSKU students who variously supported NN’s field surveys at the fish market; Peter McMillan (NIWA) for providing a reference; and Gordon Yearsley (Hobart, Australia) for editing the English text. We also thank Tomio Iwamoto and David Catania (CAS), Masaki Miya (CBM), Jun Hashimoto (FFNU), Hiroyuki Motomura (KAUM), Artem M. Prokofiev (Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow), Jeffrey T. Williams (USNM), Susan M. Morrison (WAM), Ekaterina D. Vasil’eva (ZMMU), and Kazuo Sakamoto (ZMUT) for providing opportunities to examine comparative material. This study was partly supported by a Grant-in-Aid for Scientific Research (B) from the Japan Society for the Promotion of Science, Tokyo (24370041), a Grant-in-Aid of the “Marine Science Project” of the Natural Science Cluster, Science Unit, Kochi University, and the “Kuroshio Sougou Project” of the National Museum of Nature and Science, Tsukuba.


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Copyright information

© The Ichthyological Society of Japan 2015

Authors and Affiliations

  • Naohide Nakayama
    • 1
  • Hiromitsu Endo
    • 1
  • Werner Schwarzhans
    • 2
    • 3
  1. 1.Laboratory of Marine Biology, Faculty of ScienceKochi UniversityKochiJapan
  2. 2.HamburgGermany
  3. 3.Natural History Museum of Denmark, Zoological MuseumCopenhagenDenmark

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