IUCN threat status:

Least Concern (LC)

Brief Summary

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Introduction

The original description of G. makko by Okutani and Nemoto (1964) is based on the holotype and two damaged paratype specimens found in the stomach contents of sperm whales harpooned in the Bering Sea. Afterwards, this species has been reported from deep-sea bottom trawl catches and stomach contents of sperm whales off northeastern Japan, Sea of Okhotsku and Sea of Japan (Ogata et al., 1973; Okutani et al., 1976, 1988). Nesis (1997) considered that most of those records of G. makko were the larger individuals of Gonatopsis japonicus which was described by Okiyama in 1969 from the Sea of Japan. Due mainly to bad condition of the types of G. makko, Nesis (1997) proposed that G. japonicus be recommended as the valid scientific name for G. makko. Nesis (1997) also mentiond that some of the large individuals of G. makko, including the types found in the stomach contents of sperm whales might be spent females of Gonatus madokai.

Although systematic confusion is still unsolved, the holotype of G. makko is in good enough condition to compare the other species and has apparently smaller fins than G. madokai. A small possibility exists of G. japonicus being an immature female of G. makko, even though G. makko has precedence.

Diagnosis

A Gonatopsis with...

  • slender cylindrical mantle with thin wall.
  • long arms of 2/3 mantle length.
  • small fin, fine length = fin width.

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