Under Construction
This is an archived version of a Tree of Life page. For up-to-date information, please refer to the current version of this page.

Onychoteuthis aequimanus Gabb, 1868

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
Containing group: Onychoteuthis


Gabb (1868) described Onychoteuthis aequimanus from two specimens collected near the Society Islands.  Although it was synonymized with Os. banksii by Adam (1962) and Voss (1962), several subsequent authors have recognized the existence of multiple banksii-affiliated species in the Pacific (Young & Harman 1987, Bolstad 2008).  Examination of the syntypes suggests that Os. aequimanus is the correct name for one of these Pacific species.  


  1. Photophores
    1. Two circular intestinal photophores present. Anterior photophore ~40-60% diameter of posterior photophore.
    2. Ocular photophore a long whitish patch on ventral surface of each eyeball.

  2. Measurements of larger syntype
    1. Mantle length - 93 mm
    2. Arm lengths - 37-50 mm
    3. Fin length - 49 mm
    4. Fin width - 56 mm (damaged)
    5. Club length - 24 mm (right)
    6. Club hook numbers - 23
    7. Largest hooks - Hooks V6 and V7
    8. Smallest mid-series dorsal hooks - Hooks D4 and D5

  3. Tentacle club
    1. Length ~28% ML, with 20–23 hooks.
    2. Distal-most ventral hook bases not produced into spike below ML ~90 mm; may develop small spike at greater MLs.
      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
      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



    Gabb (1868) remarked that the Os. aequimanus syntypes (two males, ANSP 6444) had been long preserved in alcohol before he received them, and had lost much pigmentation. Their soft tissues have also hardened, the tentacles appear stretched, and the hooks somewhat desiccated.  However, most of the important characters (photophores, club morphology overall body proportions, beak and radula) are in reasonable condition.


Pacific Ocean, south of 30°N; known from Hawaiian and New Zealand waters, Palmyra Island, and the Society Islands.


Adam, W. 1962. C?phalopodes de l?Archipel du Cap?Vert, de l?Angola et du Mozambique. Mem?rias da Junta de Investicac?es do Ultramar, second series, 33: 9?64, pl. 1.

Bolstad, K.S. 2008. Two new species and a review of the squid genus Onychoteuthis Lichtenstein, 1818 (Oegopsida: Onychoteuthidae) from the Pacific Ocean. Bulletin of Marine Science, 83: 481?529.

Bolstad, K.S.R. 2010. Systematics of the Onychoteuthidae Gray, 1847 (Cephalopoda: Oegopsida). Zootaxa, 2696: 186 pp.

Gabb, W.M. 1868. Description of a new species of cephalopod from the South Pacific. American Journal of Conchology, 4: 23?24, 1 pl.

Voss, G.L. 1962. List of the types and species of cephalopods in the collections of the Academy of Natural Sciences of Philadelphia. Notulae Naturae, 356: 1?7.

Young, R.E. & Harman, R.F. 1987. Descriptions of the larvae of three species of the Onychoteuthis banksii complex from Hawaiian waters. The Veliger, 29: 313?321.

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 Onychoteuthis aequimanus
Specimen Condition Dead Specimen
Size ML 15-138 mm
Copyright ©
About This Page

Page: Tree of Life Onychoteuthis aequimanus Gabb, 1868. 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:

Tree of Life Web Project. 2010. Onychoteuthis aequimanus Gabb, 1868. Version 23 December 2010 (under construction). http://tolweb.org/Onychoteuthis_aequimanus/145219/2010.12.23 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

Onychoteuthis aequimanus

Page Content

articles & notes



Explore Other Groups

random page

  go to the Tree of Life home page