Opisthoteuthis depressaRichard E. Young and Michael Vecchione
Opisthoteuthis depressa is known only from waters off Japan. It reaches a size (measured from arm tip to arm tip) of just over 200 mm. Males have a distinctive arrangement of enlarged suckers.
Figure. Oral view of male O. depressa. Drawing from Sasaki, 1929.
- Arms and web
- Arms subequal.
- Web extends nearly to arm tips along dorsal margins of arms but web along ventral margins terminates well proximally.
- Suckers in female: very small, largest ca. 2 mm in diameter; number just over 50 on each arm; suckers uniform size over most of arm, decreasing in size proximally and distally.
- Suckers in males: greatly enlarged and crowded into biserial or triserial arrangement from sucker 5-20; maximum sucker size - 7 mm in diameter in adults.
- First cirri between suckers 1 and 2.
The above description is taken from Sasaki, 1929. More details of the description of O. depressa can be found here.
O. depressa differs from all members of the genus (where males are known), except O. mero and O. robsoni, in lacking distal fields or at least lacking an increase in sucker size in the distal fields. O. depressa differs from the other two in having more enlarged suckers on each arm of the proximal field (i.e., 16 vs 5-8).
Nesis, K. N. 1982/87. Abridged key to the cephalopod mollusks of the world's ocean. 385+ii pp. Light and Food Industry Publishing House, Moscow. (In Russian.). Translated into English by B. S. Levitov, ed. by L. A. Burgess (1987), Cephalopods of the world. T. F. H. Publications, Neptune City, NJ, 351pp.
Sasaki, M. 1929. A monograph of the dibranchiate cephalopods of the Japanese and adjacent waters. Journal of the College of Agriculture, Hokkaido Imperial University, 20(Supplementary number):1-357.
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- First online 13 May 2003
Citing this page:
Young, Richard E. and Michael Vecchione. 2003. Opisthoteuthis depressa http://tolweb.org/Opisthoteuthis_depressa/20157/2003.05.13 in The Tree of Life Web Project, http://tolweb.org/. Version 13 May 2003 (under construction).