Overview

Brief Summary

Introduction

A. siedleckyi may be a southern temperate species. It resembles, however, the tropical Pacific A. heminuchalis and they may prove to be the synonymous.

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Comprehensive Description

Characteristics

  1. Tentacle clubs
    1. Two or three hooks on ventral side.
    2. Two rows of large suckers on dorsal side of manus.

  2. Hectocotylus
    1. Left ventral arm of male hectocotylized.
    2. Hectocotylus with two different sized off-set flaps: an elongate, proximal flap on ventral margin and much shorter, distal flap on dorsal margin.

  3. Eye Photophores
    1. Five complex organs: two terminal, opaque organs and three intermediate silvery organs.
    2. Posterior opaque organ much larger than others; anterior opaque photophore about the same size as the largest intermediate organ.

      Figure. Ventral view of the ocular photophores of A. siedleckyi, holotype. Drawing from Lipinski (1983).

  4. Integumental Photophores
    1. Arms IV with scattered photophores between the two photophore series (the series on the edge of the lateral memberane constitutes a third series).
    2. Ventral mantle and head with scattered arrangement of integumental organs.

  5. Mantle apex ("tail")
    1. Broad and extends well beyond conus of gladius.

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Distribution

Range Description

This species occurs in southern temperate waters. The type locality is off South Africa. A similar specimen has been caught off Australia, but the taxonomy is not well delineated and it is not clear that Abralia siedleckyi actually has this wide distribution. Abralia siedleckyi is very similar to Abralia heminuchalis which is known from tropical waters of the Pacific Ocean and the two species may be synonymous (Tsuchiya and Young 2014). The true distribution cannot be resolved until the taxonomy is resolved.
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Source: IUCN

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Geographical distribution

Information on distribution is scarse. The type locality is off southwest Cape, South Africa at 39°05'S, 13°43'E. A very similar specimen was collected from the southeast coast of Australia.

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Ecology

Habitat

mesopelagic
  • UNESCO-IOC Register of Marine Organisms
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Habitat and Ecology

Habitat and Ecology

Abralia species are small squids; some species inhabit the mesopelagic-boundary region (Young and Tsuchiya 2009). Enoploteuthids generally occur in mid-depths in the ocean and occasionally over the continental shelf (Norman 2003). They undergo diel vertical migrations, rising into the upper water column at night to feed (Norman 2003). Females spawn small eggs (0.9 and 1.5 mm in diameter depending on species, Young et al. 1992) individually into gelatinous strings (Norman 2003).


Systems
  • Marine
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Source: IUCN

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
DD
Data Deficient

Red List Criteria

Version
3.1

Year Assessed
2014

Assessor/s
Barratt, I. & Allcock, L.

Reviewer/s
Young, R., Vecchione, M. & Böhm, M.

Contributor/s
Duncan, C. & Carrete-Vega, G.

Justification
There are taxonomic issues surrounding this nominal species. Until the taxonomy is resolved we consider it Data Deficient. Further research is recommended in order to determine the precise distribution, population dynamics, life history and ecology, and potential threat processes affecting this species.
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Population

Population
There is no population information available for this species.

Population Trend
Unknown
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Threats

Major Threats
The threats to this species are not known.
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Management

Conservation Actions

Conservation Actions
There are no species-specific conservation measures in place for this species. Further research is recommended in order to determine the taxonomy, precise distribution, population dynamics, life history and ecology, and potential threat processes affecting this species.
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Wikipedia

Abralia siedleckyi

Abralia siedleckyi is a species of enoploteuthid cephalopod known from its type locality in the waters off South Africa. It resembles A. heminuchalis, and may be synonymous with it.

References[edit]

  1. ^ Barratt, I. & Allcock, L. (2014). "Abralia siedleckyi". IUCN Red List of Threatened Species. Version 2014.2. International Union for Conservation of Nature. Retrieved 28 August 2014. 
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