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Figure. Dorsal view of the holotype of O. robsoni. Photograph from Adam (1962).
- Arms
- Arms IV longest. Arm IV 57-86% of ML.
- Tentacles
- Club slender.
- Carpal locking apparatus with 10-12 suckers.
- Terminal (distal) club pad with 12-17 small suckers.
- Head
- Beak
- 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.
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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.
- Radula
- Rhachidian and first lateral teeth with accessory cusps (Adam, 1962).
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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 copyright © 2003 , , , and K.S.R. Bolstad
Page: Tree of Life
Onykia robsoni: Description Continued
Authored by
Richard E. Young, Michael Vecchione, Kotaro Tsuchiya, and K.S.R. Bolstad.
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