Abraliopsis (Micrabralia)
Richard E. Young
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close boxIntroduction
The subgenus Micrabralia is presently a catch-basket for species that don't fit into the other two subgenera. The only unifying characters are (1) the presence of complex, integumental photophores in linear series on the head (in which it differs from A. (Abraliopsis) and A. (Boreabraliopsis) but shares with A. (Pfefferiteuthis), and (2) the absence of all the male modifications of both arms IV of A. (Pfefferiteuthis). A. (Micrabralia) gilchristi has strong similarities in character 1 with species of A. (Abraliopsis) and in character 2 with species of A. (Pfefferiteuthis).Characteristics
Table. This table compares major features of the five species of the subgenus.
| A. gilchristi | A. lineata | Abraliopsis sp. NC1 | Abraliopsis sp. E | Abraliopsis sp. NC2 | |
| Club keel | large | absent | absent | low, short | low, short |
| Carpal flap | large | absent | absent | low, short | absent |
| Size of large ventral:dorsal club hooks | >3:1 | <1.5:1 | <1.5:1 | 2.5:1 | 3:1 |
| Arms I and/or II in males with tubercules | Yes, mostly arm II | Yes, mostly arm I | Yes, only (?) arm I | No | No |
| Distal third to half of arms IV bare | No | No (?) | Yes | No | No |
| Length of arms IV | 43-62% of ML | 50-60% of ML | 75-91 (x̅ =81.5, n=12) | 81% of ML | 72-92 -(x̅ =87.1, n=7) |
| No. hooks, arms IV | 23-28 | 10-13 | 8-14 (x̅=10.6, n=14) | 18,24 | 20-29 (x̅ =23.4, n=10) |
| Spermatangia receptacles | ? | Dorsal collar, Stellate pouch, Nuchal cartilage | Dorsal collar , Stellate pouch | ? | Dorsal collar , Stellate pouch |
| No. of ventral head photophore series | 4 | 3 | 3 | 3 | 3 |
| Photophores in Medial Head Sector | None to few | Many throughout | Many throughout | None | Many throughout |
Title Illustrations
| Scientific Name | Abraliopsis sp. E |
|---|---|
| Location | Central Equatorial Pacific at 7°15'N, 149°54'W |
| Specimen Condition | Preserved |
| Sex | Male |
| Life Cycle Stage | Mature |
| View | Ventral |
| Size | 21 mm ML |
| Collector | Thomas A. Clarke |
| Image Use |
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About This Page
University of Hawaii, Honolulu, HI, USA
Correspondence regarding this page should be directed to Richard E. Young at
Page copyright © 2016
Page: Tree of Life
Abraliopsis (Micrabralia).
Authored by
Richard E. Young.
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- First online 03 November 2013
- Content changed 29 August 2016
Citing this page:
Young, Richard E. 2016. Abraliopsis (Micrabralia). Version 29 August 2016 (under construction). http://tolweb.org/Abraliopsis_%28Micrabralia%29/149533/2016.08.29 in The Tree of Life Web Project, http://tolweb.org/
