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An octopus (pl.: octopuses or octopodes [a]) is a soft-bodied, eight-limbed mollusc of the order Octopoda (/ ɒ k ˈ t ɒ p ə d ə /, ok-TOP-ə-də [3]). The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids.
Certain squid species possess a tail, which is an extension of the body past the fins. [5] The tail may be said to start at "the point where a hypothetical line, continuous with the broad posterior edge of the fin, crosses the midline of the body". [ 1 ]
Octopuses swim headfirst, with arms trailing behind. While most cephalopods can move by jet propulsion, this is a very energy-consuming way to travel compared to the tail propulsion used by fish. [67] The efficiency of a propeller-driven waterjet (i.e. Froude efficiency) is greater than a rocket. [68]
They are nicknamed "Dumbo" octopuses because of their ear-like fins that protrude out of their bodies like elephants. They tend to live on the seafloor or hover just slightly above, ...
The octopuses seen in the videos threw silt, shells, and algae at other nearby octopuses. To do so, they gathered up the debris underneath their bodies using their arms.
Many octopus arm anomalies have been recorded, [13] [14] including a 6-armed octopus (nicknamed Henry the Hexapus), a 7-armed octopus, [15] a 10-armed Octopus briareus, [16] one with a forked arm tip, [17] octopuses with double or bilateral hectocotylization, [18] [19] and specimens with up to 96 arm branches.
“Oh the flappy, flappy ears,” another says excitedly. Dumbos are the deepest known group of octopuses, inhabiting the sea floor at depths of up to 13,000 feet. The team says that it has ...
Cirrina or Cirrata is a suborder and one of the two main divisions of octopuses. Cirrate octopuses have a small, internal shell and two fins on their head, while their sister suborder Incirrina has neither. The fins of cirrate octopods are associated with a unique cartilage-like shell in a shell sac.