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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 (Abraliopsis) having scattered photophore arrangement on ventral mantle and head, and carpal flap and distinct aboral keel on club. It resembles A. hoylei, A. pfefferi and A. tui. This group also contains several undescribed species.

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Figure. Side view of A. pacificus taken in a shipboard aquarium, Hawaiian waters. Photograph by R. Young.

 

Characteristics

  1. Tentacle clubs
    1. Two rows of Different-sized hooks on manus.
    2. Carpal flap and aboral keel distinct.
      3. Click on an image to view larger version & data in a new window
      Click on an image to view larger version & data in a new window

      Figure. Oral views of the tentaclular club of A. pacificus. Top - Northwest Pacific, male. Drawing from Tsuchiya and Okutani (1989). Bottom - Hawaiian waters, female. Photograph (preserved club) by R. Young.

  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 (right arm IV) with two different-sized flaps: long, narrow, proximal flap on ventral margin and short, distal flap on dorsal margin.
      2. Click on an image to view larger version & data in a new window
      Click on an image to view larger version & data in a new window

      Figure. Aboral (top) and oral (bottom) views of the hectocotylus of A. pacificus, male, Northwest Pacific. Drawing from Tsuchiya and Okutani (1989).

  4. Integumental Photophores
    1. Ventral mantle and head with scattered arrangement of integumental organs.

Comments

The A. (Abraliopsis) subgenus with scattered integumental photophore pattern, is a character-less group and its speciation corresponds to 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. Distribution and zoogeography of the family Enoploteuthidae in the Northwest Pacific. In: Okutani, T., O?Dor, R. K. and Kubodera, T. (eds.) 1993. Recent advances in fisheries biology (Tokai University Press. Tokyo). pp. 571-585.

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 Northwest Pacific
Reference Tsuchiya, K. and T. Okutani. 1990. Abraliopsis pacificus, a new species of the squid family Enoploteuthidae from the Northwest Pacific. Bulletin of the National Science Museum, Tokyo, (series A)16(2):47-60.
Creator K. Tsuchiya
Sex Female
View Ventral
Copyright © 1990 Bulletin of the National Science Museum, Tokyo
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Tokyo University of Fisheries, Tokyo, Japan

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Citing this page:

Tsuchiya, Kotaro. 2009. Abraliopsis pacificus Tsuchiya and Okutani 1991. Version 01 August 2009 (under construction). http://tolweb.org/Abraliopsis_pacificus/19690/2009.08.01 in The Tree of Life Web Project, http://tolweb.org/

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