Ichthyological Research

, Volume 53, Issue 2, pp 137–142 | Cite as

A new species of scabbardfish, Evoxymetopon macrophthalmus (Scombroidei: Trichiuridae), from Okinawa, Japan

  • Anirban Chakraborty
  • Tetsuo Yoshino
  • Yukio Iwatsuki
Full paper


Evoxymetopon macrophthalmus sp. nov. is described on the basis of a single specimen collected off Okinawa Island, Ryukyu Islands, Japan. Among the two valid species of Evoxymetopon, the new species is more similar to E. poeyi in having the first dorsal-fin spine enormously large, compressed, and sword shaped. It differs from E. poeyi in having the upper profile of head uniformly convex without a prominent sagittal crest (vs. with a prominent sagittal crest), tip of first anal pterygiophore connected to the last rib in the anterior part, while the first hemal spine is long and connected to the posterior margin of pterygiophore bone plate (vs. connected to the first hemal spine only), a larger eye, 4.5 times in head length (vs. 5.5–5.9 times), 15 externally visible anal-fin soft rays (vs. 20), 9 upper gill rakers of the first arch (vs. 4–6), and 60 caudal vertebrae (vs. 64).

Key words

Scombroidei Trichiuridae New species Evoxymetopon Scabbardfish 


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Copyright information

© The Ichthyological Society of Japan 2006

Authors and Affiliations

  • Anirban Chakraborty
    • 1
  • Tetsuo Yoshino
    • 2
  • Yukio Iwatsuki
    • 3
  1. 1.University of Miyazaki, The United Graduate School of Agricultural SciencesKagoshima UniversityMiyazakiJapan
  2. 2.Department of Marine Sciences, Faculty of ScienceUniversity of the RyukyusOkinawaJapan
  3. 3.Division of Fisheries Sciences, Faculty of AgricultureUniversity of MiyazakiMiyazakiJapan

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