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Abraliopsis falco Young 1972

Kotaro Tsuchiya
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.
  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.
  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.
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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

Left:Abraliopsis falco, from Okutani (1974), size, male.

Other illustrations

Copyright © 1974 T. Okutani
About This Page



Tokyo University of Fisheries, Konan, Minato, Tokyo

Citing this page:

Tsuchiya, Kotaro. 2000. Abraliopsis falco Young 1972. Version 01 January 2000 (under construction). http://tolweb.org/Abraliopsis_falco/19685/2000.01.01 in The Tree of Life Web Project, http://tolweb.org/

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Abraliopsis falco

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