Note

Onykia robsoni: Description Continued

Richard E. Young, Michael Vecchione, Kotaro Tsuchiya, and K.S.R. Bolstad
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

Figure. Dorsal view of the holotype of O. robsoni. Photograph from Adam (1962).

  1. Arms
    1. Arms IV longest. Arm IV 57-86% of ML.

    2. Tentacles
      1. Club slender.
      2. Carpal locking apparatus with 10-12 suckers.
      3. Terminal (distal) club pad with 12-17 small suckers.

    3. Head
      1. Beak
        1. The lower beak has the following characteristics. The hood is 35-40% of the crest length; the jaw angle is obtuse; a prominent lateral-wall fold is present and thickened on one side. These characteristics are from Clarke, 1980.
        2. 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

          Figure. Side view of lower beak of O. robsoni and sequential cross-sections through one side of the crest and lateral wall. Drawings from Clarke, 1980.

      2. Radula
        1. Rhachidian and first lateral teeth with accessory cusps (Adam, 1962).
        2. 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

          Figure. View of half a row of radular teeth of O. robsoni. Drawing from Adam, 1962.

    Comments

    Except where indicated, the above description is taken from Kubodera et al. (1998).

References

Adam, W. 1962. Cephalopodes de l'Archipel du Cap-Vert, de l'Angola et du Mozambique. Memorias da Junta de Investigacoes do Ultramar, series 2, 33: 9-64.

Clarke, M. R. 1980. Cephalopoda in the diet of sperm whales of the Southern Hemisphere and their bearing on sperm whale biology. Discovery Reports, 37: 1-324.

T. Kubodera, U. Piatkowski, T. Okutani and M.R. Clarke.  1998. Taxonomy and Zoogeography  of the Family Onychoteuthidae (Cephalopoda: Oegopsida).  Smithsonian Contributions  to  Zoology, No. 586: 277-291. 

About This Page


University of Hawaii, Honolulu, HI, USA


National Museum of Natural History, Washington, D. C. , USA


Tokyo University of Fisheries, Tokyo, Japan

K.S.R. Bolstad
Auckland University of Technology

Correspondence regarding this page should be directed to K.S.R. Bolstad at

Page: Tree of Life Onykia robsoni: Description Continued Authored by Richard E. Young, Michael Vecchione, Kotaro Tsuchiya, and K.S.R. Bolstad. 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.

close box

This page is a note that is attached to a leaf of the Tree of Life.

ToL notes provide brief accounts of characteristics, short summaries, commentaries, media files, taxonomic information, or identification tools for a given group of organisms.

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

Onykia (Onykia) robsoni

Page Content

articles & notes

collections

people

Explore Other Groups

random page

  go to the Tree of Life home page
top