Overview

Brief Summary

Introduction

Species of Abraliopsis are small squids that are most easily recognized by spherical "black" photophores (usually three) at the tip of each Arm IV. The black appearance is due to black chromatophores that tightly cover the photophores but when the latter luminesce, the chromatophores withdraw from the photophores. This feature is shared with Watasenia scintillans from waters around Japan.

Brief diagnosis:

An enoploteuthid ...

  • with large, black photophores at the tips of arms IV.
  • with hooks of manus in two series.

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Comprehensive Description

Characteristics

The following characters are from Young, et al., 1998.

  1. Arms
    1. Suckers absent from arms IV (only hooks present).
    2. Right arm IV hectocotylized.

  2. Tentacles
    1. Manus of club with two series of hooks and one series of suckers.

  3. Buccal crown
    1. Buccal crown with dark epithelial pigmentation on oral surface rather than typical chromatophores.*

      Figure. Side view of A. pacificus. White arrow points to pigmented buccal crown. Black arrows point to large, pigmented photophores at the tips of arms IV. Photograph by R. Young.

  4. Figure. Ventral surface of the head and photophores of Abraliopsis pacificus. The photo on the left is an enlargement of some of the photophores.

    Fins
    1. Fins extend to posterior end of tail.

  5. Photophores
    1. Two to four large photophores covered by black chromatophores on tips of each arm IV (see photograph under "Buccal crown.")*
    2. Five photophores on eyeball.*
    3. Complex organs of integument, in life, with red-colored filters.*

As in most other genera of the family, Abraliopsis has three types of integumental photophores covering the arms, head, funnel and mantle. The right-hand photo shows the ventral surface of the head and funnel. The most complex of the integumental photophores have red color filters. The other two types appear as blue photophores with white cores in the photos and can be separated only by size in these pictures. Large white ocular photophores are also easily seen through the skin.

*Characters shared with Watasenia

Classification

Species of Abraliopsis can be placed into three subgenera but these may not all be natural groups. Tsuchiya and Okutani (1988) suggested that A. felis be placed in a separate subgenus, Boreabraliopsis. The following table shows the primary taxonomic features of each group.

Abraliopsis
(Abraliopsis)
Abraliopsis
(Micrabralia)
Abraliopsis
(Pfefferiteuthis)
Oral surface of arms in males
Smooth
Arms I & II with papillae
Some or all arms with papillae
Ventral protective membrane of left arm IV, male, Virtually absent Virtually absent
Greatly enlarged membrane and trabeculae
Photophore arrangement on ventral surface of head
Scattered
Linear
Linear

Figure. Arms IV from arms IV showing some of the group characters. Note the papillae at the base of the arms in A. falco and the smooth arms in A. felis, and the greatly expanded ventral membrane on the left arm IV of A. falco. Drawings from Young (1972).

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Ecology

Habitat

Known from seamounts and knolls
  • Stocks, K. 2009. Seamounts Online: an online information system for seamount biology. Version 2009-1. World Wide Web electronic publication.
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Depth range based on 562 specimens in 15 taxa.
Water temperature and chemistry ranges based on 518 samples.

Environmental ranges
  Depth range (m): 7.5 - 4930
  Temperature range (°C): 1.813 - 28.444
  Nitrate (umol/L): 0.037 - 41.705
  Salinity (PPS): 33.063 - 39.014
  Oxygen (ml/l): 0.105 - 6.275
  Phosphate (umol/l): 0.029 - 3.320
  Silicate (umol/l): 0.528 - 138.617

Graphical representation

Depth range (m): 7.5 - 4930

Temperature range (°C): 1.813 - 28.444

Nitrate (umol/L): 0.037 - 41.705

Salinity (PPS): 33.063 - 39.014

Oxygen (ml/l): 0.105 - 6.275

Phosphate (umol/l): 0.029 - 3.320

Silicate (umol/l): 0.528 - 138.617
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:9Public Records:0
Specimens with Sequences:6Public Species:0
Specimens with Barcodes:6Public BINs:0
Species:2         
Species With Barcodes:1         
          
Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Locations of barcode samples

Collection Sites: world map showing specimen collection locations for Abraliopsis

Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Wikipedia

Abraliopsis

Abraliopsis is a genus of squid in the family Enoploteuthidae comprising 11 nominal species. Species are characterised by the presence of photophores on arm pair IV. Suckers are absent from this arm. The type species is Abraliopsis hoylei.

Species

The species listed above with an asterisk (*) is questionable and needs further study to determine if it is a valid species or a synonym.

Creative Commons Attribution Share Alike 3.0 (CC BY-SA 3.0)

Source: Wikipedia

Unreviewed

Article rating from 0 people

Default rating: 2.5 of 5

Disclaimer

EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!