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Abraliopsis falco Young 1972

Kotaro Tsuchiya
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Containing group: Abraliopsis

Introduction

A. falco is characterized by having stripes of integumental photophore on the mantle and unusual arm modification of the male.

Characteristics

  1. Tentacle clubs
    1. Two rows of different-sized hooks on manus.
    2. Carpal flap absent; aboral keel short, narrow.
      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 tentacular club of A. falco, 40 mm ML, off Southern California.Drawing from Young (1972).

  2. Arms
    1. Arms IV relatively long; ALI IV = 55-79.
    2. Arms I-III with 15 to 34 hooks and distal suckers.
    3. Female with 21-26 hooks on arm IV; male with 26-31 hooks on hectocotylized arm (right arm IV) and 40-45 hooks on modified left arm IV.
  3. Hectocotylus and male sexual dimorphism
    1. Hectocotylus with two subequal-sized offset flaps.
    2. Modified portion of hectocotylus without armature.
    3. Protective membrane and its spatulate trabeculae well developed on left arm IV, web-like; with minute conical papillae on trabeculae.
    4. Oral surface of arms I-III ornamented with small numerous conical papillae.
      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 arms IV of A. falco, mature male, off Southern California. Drawing from Young (1972).

  4. Integumental Photophores
    1. Ventral mantle with six narrow longitudinal stripes of large integumental organs and and scattered intermediate small organs with a distinct wide mid-ventral photophore-less strip.
    2. Ventral head with three rows of narrow, longitudinal stripes and some intermediate scattered organs.
    3. Rows of organs along ventral side of arm III and dorsal side of arm IV is interrupted.

Distribution

Geographical Distribution

This species is distributed in the tropical East Pacific from 30° N (Young, 1972) and southward to about 20° S (Okutani, 1974).

References

Okutani, T. 1974. Epipelagic decapod cephalopods collected by midwater tows during the EASTROPAC Expedition, 1967-1968 (systematic part). Bull. Tokai Reg. Fish. Res. Lab., 80:29-118.

Young, R.E. 1972. The systematics and areal distribution of pelagic cephalopods from the sea off southern California. Smiths. Contr. Zool., 97:1-159.

Title Illustrations
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Click on an image to view larger version & data in a new window
Scientific Name Abraliopsis falco
Location Off Southern California
Reference Young, R.E. 1972. The systematics and areal distribution of pelagic cephalopods from the sea off southern California. Smiths. Contr. Zool., 97:1-159.
Sex Male
View Ventral
Size 37 mm ML
About This Page


Tokyo University of Fisheries, Tokyo, Japan

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Citing this page:

Tsuchiya, Kotaro. 2009. Abraliopsis falco Young 1972. Version 01 August 2009 (under construction). http://tolweb.org/Abraliopsis_falco/19685/2009.08.01 in The Tree of Life Web Project, http://tolweb.org/

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