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Enoploteuthis chuni Ishikawa 1914

Kotaro Tsuchiya
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Containing group: Enoploteuthis

Introduction

Enoploteuthis chuni is a mesopelagic boundary species associated with the shelf waters of Japan and adjacent waters (Tsuchiya, 1993; Young, 1995).

Characteristics

  1. Tentacle
    1. Tentacle long, with distinct club.
    2. Carpal cluster oval.
    3. Two rows of different-sized hooks on manus.
    4. Four rows of suckers on dactylus.
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      Click on an image to view larger version & data in a new window

      Tentacle club, Northwest Pacific, by Tsuchiya and Okutani (1989).

  2. Hectocotylus
    1. Hectocotylus with two subequal-sized offset flaps.
    2. Modified portion without armature.
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      Click on an image to view larger version & data in a new window

      Hectocotylus, Northwest Pacific, by Tsuchiya and Okutani (1989), male.

  3. Integumental Photophores
    1. Ventral mantle with six longitudinal stripes of integumental organs anteriorly but become diffused posteriorly.
    2. Ventral head with three longitudinal stripes of integumental organs.
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      Click on an image to view larger version & data in a new window

      Figure. Ventral view of the head of E. chuni, Sea of Japan, showing arrange of photophores. Note the orange photosensitive vesicles. Photograph by Danté Fenolio.

    3. Ventral side of arm III with a series of organs on almost entire arm length along the base of aboral keel.

Life history

Spawning

In the Japan Sea, it was estimated that a female spawns about 5,500-13,000 eggs in summer.

Eggs

Eggs are oval, weakly greenish tint.

Distribution

Geographical distribution

This species seems to be a mesopelagic boundary species associated with continental or island shelves (Tsuchiya, 1993; Young, 1995). It is distributed from off the Philippines, East China Sea, Japanese coast of Japan Sea, Kuroshio-Oyashio transition zone to near Hawaiian waters.

References

Tsuchiya, K. 1993.

Young, R.E. 1995. Aspects of the natural history of pelagic cephalopods of the Hawaiian mesopelagic-boundary region. Pacific Science, 49:143-155.

Title Illustrations
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Scientific Name Enoploteuthis chuni
Reference from Tsuchiya, 2000
Sex Male
About This Page


Tokyo University of Fisheries, Tokyo, Japan

Citing this page:

Tsuchiya, Kotaro. 2007. Enoploteuthis chuni Ishikawa 1914. Version 16 June 2007 (under construction). http://tolweb.org/Enoploteuthis_chuni/19706/2007.06.16 in The Tree of Life Web Project, http://tolweb.org/

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