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Oji T, Ogawa Y, Hunter AW, Kitazawa K (2009) Discovery of dense aggregations of stalked crinoids in Izu-Ogasawara Trench, Japan. Jamieson AJ, Ramsey J, Lahey P (2019) Hadal manned submersible: five deeps expedition explores the deepest point in every ocean. Jamieson AJ, Vecchione M (2020) First in situ observation of Cephalopoda at hadal depths (Octopoda: Opisthoteuthidae: Grimpoteuthis sp.). Jamieson AJ, Stewart HA (2021) Hadal zones of the Northwest Pacific Ocean. Guerrero-Kommritz J, Cantera J, Puentes V, Leon J (2018) First observations of the bigfin squid Magnapinna sp. Guerra A, González AF, Rocha F, Segonzac M, Gracia J (2002) Observations from submersibles of rare longarm bathypelagic squids. Zool Zhurn 34(4):842–849Ĭollins MA, Villanueva R (2006) Taxonomy, ecology and behaviour of the cirrate octopods. Nauka, Moscowīirstein YA, Vinogradov MY (1955) Observations about the diet of Deep-Sea Fish in the Kuril-Kamchatka Basin.
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Izs-vo AN SSSR, Moscow, p 236īelyaev GM (1989) Deep-sea ocean trenches and their fauna. These observations extend the known hadal occurrence of cirrates, and cephalopods in general, from the Indian Ocean to the equatorial North Pacific Ocean, suggesting that their global presence in depths > 6000 m may be more extensive than previously recognized.Īkimushkin II (1963) Golovonogiye mollyuski morey SSSR. Although the video quality was poor, these octopods did not appear to be the same species as those reported previously in the Java Trench. We also observed four cirrate octopods between 62 m. This observation is the first record of squid at hadal depths and extends the known bathymetric range for any squid by 1477 m an increase of ca. The filaments may have been contracted or may not yet have developed. The long slender terminal arm and tentacle filaments characteristic of adult Magnapinna were not obvious in the video. The estimated mantle length of the squid was ca. During a manned submersible dive in the Philippine Trench, a solitary oegopsid squid of the monogeneric family Magnapinnidae was observed swimming close to the seafloor at 6212 m.