Grimpoteuthis

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Grimpoteuthis
Grimpoteuthis discoveryi
Scientific classification e
Kingdom:Animalia
Phylum:Mollusca
Class:Cephalopoda
Order:Octopoda
Family:Opisthoteuthidae
Genus:Grimpoteuthis
Robson, 1932
Species

14, see text

 
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Grimpoteuthis
Grimpoteuthis discoveryi
Scientific classification e
Kingdom:Animalia
Phylum:Mollusca
Class:Cephalopoda
Order:Octopoda
Family:Opisthoteuthidae
Genus:Grimpoteuthis
Robson, 1932
Species

14, see text

The octopuses of the genus Grimpoteuthis are also known as Dumbo octopuses from the ear-like fins protruding from the top of their head-like bodies, resembling the ears of Walt Disney's flying elephant Dumbo.

They are bathyal creatures, living at extreme depths of 3,000 to 4,000 metres (9,800 to 13,100 ft) with some living up to 7,000 metres (23,000 ft) below sea level, which is the deepest of any known octopus.[citation needed] They are some of the rarest of the Octopoda species. They can flush the transparent layer of their skin at will, and are pelagic animals, as with all other cirrate octopuses. The largest Dumbo octopus ever recorded was 6 feet (1.8 m) in length and weighed 13 pounds (5.9 kg), although the normal size for the various species is thought to be smaller.[1]

Dorsal (left) and ventral aspects of a mature female of G. innominata (73 mm ML)

They hover above the sea floor, searching for polychaetes, pelagic copepods, isopods, amphipods, and other crustaceans for food.[2] The Dumbo octopus is strange in the way it consumes food in that it swallows its prey whole, which differs from any other kind of octopus.[citation needed] They move by pulsing their arms, shooting water through their funnel, by waving their ear-like fins, or any combination thereof. Males and females differ in their size and sucker patterns. Dissected females have yielded eggs during different stages of development, which has led to the conclusion that females lay eggs constantly, with no distinct breeding season.[3] Male Dumbo octopuses possess an enlarged segment on one of their arms, similar to the hectocotylus arm of other cephalopods. It is likely that this modified arm transfers masses of spermatophores into the female during copulation, as occurs in other cephalopods. The Dumbo Octopus (Grimpoteuthis) is widely believed to be fake.[4]

Species[edit]

Grimpoteuthis umbellata

Several species formerly classified in this genus were moved to other opisthoteuthid genera.[5]

References[edit]

  1. ^ "NOAA Researchers, Ships Participate in Census of Marine Life’s Decade of Discovery" (Press release). National Oceanic and Atmospheric Administration. November 23, 2009. Retrieved May 11, 2011. 
  2. ^ Collins, M.A. & R. Villaneuva. (2006). Taxonomy, ecology and behaviour of the cirrate octopods. In: Gibson, R.N., R.J.A. Atkinson & J.D.M. Gordon (eds.) Oceanography and Marine Biology: An Annual Review, Volume 44. Taylor and Francis, London. pp. 277–322.
  3. ^ "Dumbo Octopus Information : Fun & Interesting Facts". Brighthub.com. Retrieved 2011-02-17. [self-published source?]
  4. ^ http://www.aquariumofpacific.org/onlinelearningcenter/species/dumbo_octopus"essay: dumbo octopus". Web.mac.com. 2008-11-20. Retrieved 2011-02-17. [self-published source?]
  5. ^ Collins, Martin A. (2003). "The genus Grimpoteuthis (Octopoda: Grimpoteuthidae) in the north-east Atlantic, with descriptions of three new species". Zoological Journal of the Linnean Society 139: 93–127. doi:10.1046/j.1096-3642.2003.00074.x. 

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