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Abraliopsis pacificus Tsuchiya and Okutani 1991

Kotaro Tsuchiya
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Containing group: Abraliopsis

Introduction

A. pacificus distributes from the Northwest Pacific to Hawaiian waters along the southern border of Kuroshio Current and its extension waters. This species is a typical Abraliopsis-type having scattered photophore arrangement on ventral mantle and head, and carpal flap and distinct aboral keel on club. It is resembles to A. hoylei, A. pfefferi and A. tui. This group also contains several undescribed species.

Characteristics

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

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

  1. Tentacle clubs
    1. Two rows of Different-sized hooks on manus.
    2. Carpal flap and aboral keel distinct.

  2. Arms
    1. Arms IV is relatively long; ALI IV = 62-76.
    2. Arms with 16 to 25 hooks and 12-25 suckers.
  3. Hectocotylus
    1. Hectocotylus with two different-sized flaps: long narrow proximal and short distal ones.
  4. Integumental Photophores
    1. Ventral mantle and head with scattered arrangement of integumental organs.

Comments

This group with scattered integumental photophore pattern, is a character-less group and speciate corresponding with each watermass. They are identified by some morphometric or meristic characters such as fin length index, arm length index, hook and sucker count, etc.

Distribution

Geographical Distribution

This species is distributed from the Northwest Pacific to Hawaiian waters (Tsuchiya, 1993; Young, 1995).

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 Abraliopsis pacificus
Location off Hawaii
ToL Image Use creative commons This media file is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0.
Copyright © 2000 Richard E. Young
Scientific Name Abraliopsis pacificus
Location Northwest Pacific
Reference from Tsuchiya (2000)
Sex Female
Copyright © 2000
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Tokyo University of Fisheries, Tokyo, Japan

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Citing this page:

Tsuchiya, Kotaro. 2000. Abraliopsis pacificus Tsuchiya and Okutani 1991. Version 01 January 2000 (under construction). http://tolweb.org/Abraliopsis_pacificus/19690/2000.01.01 in The Tree of Life Web Project, http://tolweb.org/

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