Under Construction

Abraliopsis (Abraliopsis)

Richard E. Young
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
taxon links [up-->]Abraliopsis hoylei [up-->]Abraliopsis sp. B [up-->]Abraliopsis pacificus [up-->]Abraliopsis sp. NC4 [up-->]Abraliopsis tui [up-->]Abraliopsis sp. Z [up-->]Abraliopsis morisii [down<--]Abraliopsis Interpreting the tree
close box

This tree diagram shows the relationships between several groups of organisms.

The root of the current tree connects the organisms featured in this tree to their containing group and the rest of the Tree of Life. The basal branching point in the tree represents the ancestor of the other groups in the tree. This ancestor diversified over time into several descendent subgroups, which are represented as internal nodes and terminal taxa to the right.

example of a tree diagram

You can click on the root to travel down the Tree of Life all the way to the root of all Life, and you can click on the names of descendent subgroups to travel up the Tree of Life all the way to individual species.

For more information on ToL tree formatting, please see Interpreting the Tree or Classification. To learn more about phylogenetic trees, please visit our Phylogenetic Biology pages.

close box
Containing group: Abraliopsis

Introduction

Species of Abraliopsis (Abraliopsis), with the exception of A. (Boreabraliopsis) felis, are recognized by their scattered photophore patterns of both complex and non-complex photophores. Their differences with A. felis are given on the A. (B.) felis page. Within the scattered arrangement there may be subtle patterns that are difficult to recognize which makes species identification mostly dependent on non-photophore characters.

Characteristics

The relationships of the species of Abraliopsis (Abraliopsis) is summarized in the following table.

  A. pacificus
A. tui
A. sp. B
A. sp. NC4
A. morisii
A. hoylei
A. sp. Z
Distribution
Subtropical northwestern Pacific
Subtropical Pacific near New Zealand
Tropical central Pacific
Tropical Pacific near New Caledonia
Tropical-temperate Atlantic
Tropical Indian Ocean
Subtropical, temperate South Atlantic
Dorsal flap on hectocotylus
Yes
No
No
Yes
Yes
 ? No
Arms IV length index (=%MLx100)
x̅ = 68
100-110 
x̅ = 74
x̅ = 90 ca. 70-90
75 (?)
~80
Median Mantle Sector with bare-strip indistinct in anterior 1/5 of mantle.
Yes
No
Yes
Yes
Yes
Yes
No
1st Lateral Window  Series with gap
Yes, but minor
 ? Yes, but minor Yes, but minor No
?
No
Second lateral window series present
Yes (28 mm ML)  ? No (26 mm ML) No (26 mm ML) Yes (25 mm ML) ? Yes, but large gap. (29 mm ML)
Lateral Funnel-Groove series
2+2, non-overlaping (28 mm ML) 
 ? 2+2, non-overlaping (26 mm ML) 
2+2, non-overlaping (26 mm ML)
4+2, overlapping (at 35 mm)
?
3+3, non-overlapping (29 & 35 mm ML)
Olfactory Photophore/Series
Red/Absent (28 mm ML) ?
Blue/Absent  (26 mm ML) Red/Absent (26 mm ML) Blue/absent (35 mm ML) ?
Red/present (29 mm ML)
 Head width index (=%MLx100) Males: x̅ = 35
Females:
x̅ = 33
?
Males: x̅ = 45
Females: x̅ = 41
 ?  Females: x̅ = 40
?
x̅ = 39 combined sexes
Distinct posterior crescent ridge connects occipital folds 3 and 4
 No Yes
No
 Yes Yes
?
Yes
Fin width index (=%MLx100) x̅ = 92
101-111
x̅ = 106
x̅ = 100 ?
95
100
No. arm IV hooks
x̅ = 21 
17-23
x̅ =12.5 (11-14)
x̅ = 18.8 (16-21)
?
19-21 (?) 18; 20 (hecto)
Length: sperm mass/spermatophore
0.15
0.4
    0.25
   
Lateral head sector, red photophores *
 5-7 (28 mm ML) ?
6 (26 mm ML) 0-1 (26 mm ML) 9-11 (25 mm ML) ?
 Not Applicable

x̅ = "x-bar" = mean

* - Difficult character to use as Sectors are somewhat arbitrary and number of red photophores is dependent on size as well as species.

Comments

This table indicates that the presence or absence of a dorsal flap on the hectocotylus is a critical character in identifying species. Unfortunately it can be a difficult character to recognize if squid are not in very good condition. The two species (A. tui and A. sp. B) that lack a dorsal flap are easily separated by the several characters of which (1) the number of hooks on arms IV and (2) the median strip bare of photophores in the anterior 1/5 of the mantle (most/all species have a bare strip in the posterior 2/3 of the mantle). A. sp. B is also distinctive in having a very broad head which is easily recognized (see the top title photograph on this page).

Among the 4 species that have a dorsal flap on the hectocotylus, A. sp. Z is easily recognized by (1) the greater abundance and distinctive arrangement of head photophores and (2) the median strip bare of photophores in the anterior 1/5 of the mantle. The remaining three are more difficult. A. sp. NC4 is separated from A. pacificus and A. morisii by the number of red photophores present in the lateral head sector. The latter two species can be separated by (1) the color of the olfactory photophore at least between 28 and 35 mm ML and (2) their habitat. A. hoylei cannot be identified at present; its identity must wait until we know what species of Abraliopsis occur at its type locality.

Unlike members of subgenera Pfefferiteuthis and Micrabralia the club membranes and hook-sizes appear to be similar in all members of the subgenus Abraliopsis

 

Title Illustrations
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
Scientific Name Abraliopsis sp. B
Location Hawaiian waters
Specimen Condition Dead Specimen
Sex Male
Life Cycle Stage Mature
View Ventral
Size 20 mm ML
Image Use creative commons This media file is licensed under the Creative Commons Attribution License - Version 3.0.
Copyright ©
Scientific Name Abraliopsis morisii
Location North Atlantic, 43°N, 28°W
Comments Photographed aboard the R/V G.O. SARS, during the MAR-ECO expedition 2004
Specimen Condition Fresh
Body Part Photophore arrangement on head and mantle
View Ventral
Image Use creative commons This media file is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0.
Copyright ©
About This Page


University of Hawaii, Honolulu, HI, USA

Correspondence regarding this page should be directed to Richard E. Young at

Page: Tree of Life Abraliopsis (Abraliopsis). Authored by Richard E. Young. The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for reuse. Click on an image or a media link to access the media data window, which provides the relevant licensing information. For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.

Citing this page:

Young, Richard E. 2013. Abraliopsis (Abraliopsis). Version 03 November 2013 (under construction). http://tolweb.org/Abraliopsis_%28Abraliopsis%29/149532/2013.11.03 in The Tree of Life Web Project, http://tolweb.org/

edit this page
close box

This page is a Tree of Life Branch Page.

Each ToL branch page provides a synopsis of the characteristics of a group of organisms representing a branch of the Tree of Life. The major distinction between a branch and a leaf of the Tree of Life is that each branch can be further subdivided into descendent branches, that is, subgroups representing distinct genetic lineages.

For a more detailed explanation of the different ToL page types, have a look at the Structure of the Tree of Life page.

close box

Abraliopsis (Abraliopsis)

Page Content

articles & notes

collections

people

Explore Other Groups

random page

  go to the Tree of Life home page
top