Nesis (1982/87) reports it from the Bering Sea to the Sea of Okhotsk to off central Honshū in the northwestern Pacific and to off southern California in the northeastern Pacific. It is also known from Japan, off Kashima-Nada, at 530–560 m. This species has been reported off Eureka Bar, California, at 350 m. The Flapjack octopus, ( Opisthoteuthis californiana), is a species of octopus. Nesis (1982/87) reports it from the Bering Sea to the Sea of Okhotsk to off Central Honshū in the Northwestern Pacific and to off outhern California in the Northeastern Pacific. Structure of the Tree of Life page.Eureka Bar, California, at 350 m. The Tree of Life is that each branch can be further subdivided intoĭescendent branches, that is, subgroups representing distinct geneticįor a more detailed explanation of the different ToL page types, have a look at the Major distinction between a branch and a leaf of 47: 47-94.Įach ToL branch page provides a synopsis of the characteristics ofĪ group of organisms representing a branch of the Tree of Life. Deep-water octopods (Mollusca: Cephalopoda) of the Northeastern Pacific. Available at isthoteuthis/20106/2008.04.28 in The Tree of Life Web Project. Systematics, distribution and biology of the cirrate octopods of the genus Opisthoteuthis (Mollusca, Cephalopoda) in the Atlantic Ocean, with description of two new species. Current Classification of Recent Cephalopoda. The Marine Fauna of New Zealand: Octopoda (Mollusca: Cephalopoda). Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition, "Valdivia" 1898-1899, 18 (2): 405-522 + Atlas. For the purposes of this table, a distal field is considered to be absent if suckers there do not show a distinct enlargement.Ĭhun, C. ** DESD = Distal field enlarged sucker diameter PESD = Proximal field enlarged sucker diameter. Species Comparisons (from Villanueva et al., 2002, Villanueva et al., 2008 and Lu, 2010)ĭistal field: Largest sucker, mean position Digestive tract not a simple loop (i.e., intestine makes lateral bends and/or loops. Intestine approximately 1.5 - 2.0 times esophagus (and crop) in length.In this photograph, the lines of white areolar spots are easily seen, especially on the arms. In some species these are difficult to detect or absent.įigure. The extreme flatness of some Opisthoteuthis is apparent in this video. Wing frequently terminates as elongate, simple, pointed cone termination complex in some species.Īlthough the shell lies at an angle to the body axis, the variation in the angle of the spread of its lateral walls presumably is a measure of the "flatness" (i.e., compression of the anterior-poterior body axis) of the octopod.Outer surface of saddle usually with groove (narrow or broad, shallow or deep) outer surface rarely flat.U-shaped, lateral walls (=wings) not parallel (i.e., spread between walls increases toward tips).Small, length approximately half mantle width.Beaks: Descriptions can be found here: Lower beak upper beak.Optic lobe kidney-shaped in cross-section.Two or more bundles of optic tract penetrate white body.Eyes large, diameter often 60-70% of ML, 50% of head width.Also note the rather long cirri in this live Opisthoteuthis. Photograph shows multiple web nodules, some of which are indicated by the arrows. Oral view of Opisthoteuthis grimaldii (?). *Collins and Villanueva (2006) use this same diagnosis to define their family Opisthoteuthidae which contains this single genus.Ĭlick on an image to view larger version & data in a new windowįigure. Radula and posterior salivary glands absent. Two fields of enlarged suckers in mature males. Optic nerves pass through white body in two to four bundles. Shell a flaring U-shape, lateral walls tapering to fine points. Moderate-sized cirrates with small, subterminal fins. without tooth-like structures in sucker aperture.įull diagnosis of the more restrictive use of the genus (from Collins and Villanueva, 2006):.with white body penetrated by two or more separate optic nerve bundles.with areolae present at least in young.with one or two fields of enlarged suckers on arms of mature males.An introduction to an Opisthoteuthis is seen in this video.įrom Stephanie Bush, "The Opisthoteuthis eggs depicted in this video are preserved specimens, not the eggs laid at the Monterey Bay Aquarium (which are still being lovingly incubated at MBARI's Cold Storage Facility!.)" Brief diagnosis:An opisthoteuthid.
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