Ichthyological Research

, Volume 51, Issue 3, pp 248–255 | Cite as

Hemitriakis complicofasciata, a new whitefin topeshark (Carcharhiniformes: Triakidae) from Japan

  • Masafumi TakahashiEmail author
  • Kazuhiro Nakaya


Hemitriakis complicofasciata sp. nov. is described from 18 specimens from the waters of the Ryukyu Islands, southern Japan. This new species is distinguishable from other congeners by the following characters: higher vertebral counts (46–52 monospondylous vertebrae and 124–131 precaudal total vertebrae), presence of a developed posterior nasal flap, first dorsal fin origin anterior to free rear tips of pectoral fin, shorter snout length (snout tip to oral length less than 1.8 times internarial width), absence of an accessory cartilage at symphysial part of upper jaw, and dark complicated lines and rings on embryos and juveniles.

Key words

Carcharhiniformes Triakidae New species Hemitriakis complicofasciata Japan 


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Copyright information

© The Ichthyological Society of Japan 2004

Authors and Affiliations

  1. 1.Laboratory of Marine Biodiversity, Graduate School of Fisheries SciencesHokkaido UniversityHokkaidoJapan

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