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Abraliopsis chuni Nesis 1982

Kotaro Tsuchiya
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Containing group: Abraliopsis

Introduction

A. chuni is based on the illustration of the enoploteuthid squid from the Indian North Equatorial Current in Chun (1910). Details of morphology and distribution are still unertain.

Characteristics

  1. Tentacle clubs
    1. Two rows of distinct different-sized hooks on manus.
    2. Carpal flap and aboral keel present.
      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. chuni, male, equatorial Indian Ocean. Drawing from Chun (1910).

  2. Arms
    1. Arms IV relatively long.

  3. Hectocotylus and male sexual dimorphism
    1. Male hectocotylization uncertain.

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

Nomenclature

Chun (1910) redescribed Abraliopsis morisii (Vérany, 1839) from Atlantic and Indian Ocean specimens. The illustrations accompanying the text clearly show that more than one species was included in the description. Subsequently, Nesis (1982) named, on the basis of these illustrations, two new species of Abraliopsis (i.e., A. atlantica and A. chuni).

Distribution

Geographical Distribution

Tropical Indo-West Pacific, from eastern Africa to Line Island. Mainly equatorial species (Nesis, 1982/87).

References

Okutani, T. 1974. Epipelagic decapod cephalopods collected by midwater tows during the EASTROPAC Expedition, 1967-1968 (systematic part). Bulletin of Tokai Regional Fisheries Research Laboratory, 80:29-118.

Nesis, K. N. 1982. Abridged key to the cephalopod mollusks of the world's ocean. 385+ii pp. Light and Food Industry Publishing House, Moscow. (In Russian.). Translated into English by B. S. Levitov, ed. by L. A. Burgess (1987), Cephalopods of the world. T. F. H. Publications, Neptune City, NJ, 351pp.

Young, R.E. 1972. The systematics and areal distribution of pelagic cephalopods from the sea off southern California. Smithsonian Contribution to Zoology, 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 chuni
Location North Equatorial Current, Indian Ocean at 1°49'N. 45°29'E
Reference Chun, C. 1910. Die Cephalopoden. Oegopsida. Wissenschaftliche eregebnisse der deutschen tiefsee expedition auf dem dampfer "Valdivia" 1898-1899, 18(1):1-401
Sex Female
View Dorsal (top), ventral (bottom)
Size 39 mm ML
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Tokyo University of Fisheries, Tokyo, Japan

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Citing this page:

Tsuchiya, Kotaro. 2009. Abraliopsis chuni Nesis 1982. Version 01 August 2009 (under construction). http://tolweb.org/Abraliopsis_chuni/19684/2009.08.01 in The Tree of Life Web Project, http://tolweb.org/

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