Onykia (Moroteuthopsis) ingensMichael Vecchione, Richard E. Young, and Kotaro Tsuchiya
O. ingens reaches a length of at least 500 mm ML (Kubodera, et al., 1998) and is found in circumpolar but mostly sub-Antarctic waters.
An Onykia ...
- with rhomboidal fins (ie fins not drawn-out posteriorly).
- with warts on the skin.
- with rostrum of gladius having a triangular cross-section.
- Club with usually 14 pairs of hooks (range - 13-16 hooks, dorsal series, 13-15, ventral series).
- Ventral mantle with soft, irregular warts.
- Rhomboidal shape, not drawn out into a tail.
- Length 50-60% of ML.
- Width 60-70% of ML.
- Maximum width of vanes ca. 11% of gladius length (to tip of conus).
- Rostrum 11-12% of the ML, triangular in cross-section.
commentsThis description is taken from Pfeffer (1912).
The tentacular club of a young O. ingens, 77mm ML has a few marginal suckers still remaining on the proximal dorsal margin and on the distal ventral margin.
Figure. Oral view of tentacular club of O. ingens, 77 mm ML. Drawing from Tsuchiya and Okutani, 1981, p. 145, Fig. 35.
Dubinina (1980) described a juvenile squid from the Southwest Atlantic as Onykia robsoni (drawing to the right) but according to C. Nigmatullin (personal communication) it probably is a young O. ingens. The scale bar is 1 mm.
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.
Dubinina, T. S. 1980. On a finding of a larvae Moroteuthis robsoni (Oegopsida, Onychoteuthidae) in South-west Atlantic.
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.
Tsuchiya, K., and T. Okutani. 1991. Growth Stages of Moroteuthis robusta (Verrill, 1881) with the Re-evaluation of the Genus. Bulletin of Marine Science, 49(1/2):137-147.
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- First online 23 June 2003
Citing this page:
Vecchione, Michael, Richard E. Young, and Kotaro Tsuchiya. 2003. Onykia (Moroteuthopsis) ingens http://tolweb.org/Onykia_%28Moroteuthopsis%29_ingens/19972/2003.06.23 in The Tree of Life Web Project, http://tolweb.org/. Version 23 June 2003 (under construction).