Under Construction

Abraliopsis pacificus Tsuchiya and Okutani 1991

Kotaro Tsuchiya and Richard E. Young
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Containing group: Abraliopsis (Abraliopsis)

Introduction

A. pacificus is distributed from the Northwest Pacific along the southern border of Kuroshio Current and its extension waters.  Females reach at least 36 mm ML and males 26 mm ML.

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. Ventral view of a paratype of A. pacificus, female, 26 mm ML. Photograph by R. Young.

Brief diagnosis

An Abraliopsis (Abraliopsis) ...

Characteristics

 In addition to familial characters (listed on the Enoploteuthidae page) and generic characters (listed on the Abraliopsis page), Abraliopsis pacificus has:
  1. Tentacle clubs
    1. Two rows of Different-sized hooks on manus.
    2. Carpal flap and aboral keel, large.
    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 view of the tentaclular club of A. pacificus, northwest Pacific, male. Drawing from Tsuchiya and Okutani (1989).

  2. Head
    1. Occipital folds 2-4 not clearly connected by posterior crescent ridges.
    2. Head width index - Males: 30.7-39.9 (x̅ = 35.4, n = 5); Females: 30.9-33.8 (x̅ = 32.9, n = 5).

  3. Arms
    1. Arms IV of moderate length; ALI IV = 62-76 (x̅ = 68.2, n = 16).
    2. Arms with 16-30 hooks (mainly 16-23, x̅ = 21, n = 15) and 10-25 distal suckers.

  4. Hectocotylus
    1. Hectocotylus (right arm IV) with two different-sized flaps: long, narrow, proximal flap on ventral margin and short (about 1/4 length of ventral flap), 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).

  5. Fin width index - 88-95 (x̅ = 91.5, n = 10).

  6. Photophores
    1. Ocular photophores: 5 photophores on each eye.
    2. Integumental photophores: Ventral mantle and head with scattered arrangement of photophores.
      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. Ventral views of the head  and anterior mantle regions of an A. pacificus paratype, female 28 mm ML. Photograph showing integumental photophores. Right - Outline drawing from previous photograph with all integumental photophores represented by colored dots. Red dots - Complex photophores. Blue dots - Non-complex photophores. Images by R. Young.

      More details of the integumental photophores can be found here.

  7. Reproductive structures
    1. Spermatangia receptacles located dorsal-collar pocket on either side of nuchal cartilage.
  8. Measurements and counts

      Holotype
    Paratype 2
    Paratype 4 
    Paratype 8 
    Paratype 1
    Paratype 3
    Paratype 5
    Paratype 7
    Sex
    Male
    Male 
    Male 
    Male 
    Female 
    Female
    Female
    Female
    Mantle length
    26
    26
    25
    23
    36
    35
    34
    32
    Head width index
    30.7
    33.9
    34.9
    39.9
    33.4
    32.9
    30.9
    33.8
    Fin Length index 76.6
    81.2
    78.3
    77.7
    76.9
    75.6
    74.7
    76.2
    Fin width index 90.8
    87.9
    95.2
    92.3
    91.2
    90.2
    90.3
    92.9
     Arm length index: I
    36.4/33.0
    35.8/36.6
    37.4/45.4
    42.5/44.4
    46.3/44.9
    40.4/41.8
    45.0/47.7
    49.9/45.8
                       II
    43.3/48.7
    32.3/44.8
    51.4/53.0
    49.4/59.2
    52.9/50.7  45.2/43.2
    54.1/55.6
    52.9/57.6
                      III
    46.7/42.2
    41.3/38.9 44.2/49.4
    53.2/53.7
    47.7/52.1
    43.5/43.2
    49.1/48.8
    54.8/51.1
                      IV
    65.1/69.4
    64.2/63.8
    62.3/61.9
    74.7/75.8 
    74.9/76.3
    63.1/64.0
    67.4/71.8
    72.1/65.0
     No. hooks, I
    20
    21
    28
    18
    20
    19
    19
    18
                      II
    23
    19
    25
    21
    21
    23
    22
    22
                      III
    21
    21
    22
    20
    25
    17
    19
    20
                      IV
    17/17
    16/20
    16/16
    16/16
    20/23
    -/18
    19/19
    18/17
    Club length index 19.9/18.8
    22.2/21.0
    20.1/24.1
    - /-
    24.2/23.1
    19.3/21.0
    21.8/20.9
    21.7/23.5

Comments

This Abraliopsis pacificus is sometimes confused with Abraliopsis sp. B (e.g., Young, 1978. 1995).  A. pacificus, however, has ...

See Abraliopsis (Abraliopsis) page for comparisons of all species of the subgenus.

Distribution

Geographical Distribution

This species is found in the Northwest Pacific between about 30° and 35° N. (Tsuchiya and Okutani, 1990).

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. 1978. The vertical distribution and photosensitive vesicles of pelagic ceph- alopods from Hawaiian waters. Fish. Bull. 7 6 : 583-615.

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
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
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
About This Page


Tokyo University of Fisheries, Tokyo, Japan


University of Hawaii, Honolulu, HI, USA

Page: Tree of Life Abraliopsis pacificus Tsuchiya and Okutani 1991. Authored by Kotaro Tsuchiya and Richard E. Young. The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for reuse. Click on an image or a media link to access the media data window, which provides the relevant licensing information. For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.

Citing this page:

Tsuchiya, Kotaro and Richard E. Young. 2013. Abraliopsis pacificus Tsuchiya and Okutani 1991. Version 03 November 2013 (under construction). http://tolweb.org/Abraliopsis_pacificus/19690/2013.11.03 in The Tree of Life Web Project, http://tolweb.org/

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