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Opisthoteuthidae are a group of octopuses characterized by a web of skin in between their arms. They broad U-shaped shell that support muscles for a pair of small fins on the mantle, these fins are far less developed than other families in Cirrina and essentially only act as stabilizers when the animal swims (using a medusoid motion of the arms and webbing). [1]
Unable to defend themselves, octopuses often fall prey to predators. [76] This makes most octopuses effectively semelparous . The larger Pacific striped octopus (LPSO) is an exception, as it can reproduce repeatedly over a life of around two years.
With both smarts and dexterity, in addition to arms that can think for themselves, octopuses can do fascinating things. Just like the octopus did in the video when it forcibly tore off the pacifier.
Other species of octopus had been observed using shells for hiding, but this was the first case in which shells were prepared and collected for later use, in what the Melbourne Museum has described as "true tool use". [9] [4] [10] Octopuses will often engage in bipedal motion when carrying stacks of debris or items larger than themselves. [4]
Cthulhu is said to resemble a green octopus, dragon, and a human caricature, hundreds of meters tall, with webbed, human-looking arms and legs and a pair of rudimentary wings on its back. [11] Its head is depicted as similar to the entirety of a gigantic octopus , with an unknown number of tentacles surrounding its supposed mouth.
Macroctopus maorum is a large octopus and it is regularly described as a ‘robust’ species, it is a member of the Octopus macropus species complex. The morphological traits characteristic of this complex are a high number of gill lamellae, a robust conical copulatory organ and arms of varying length with long unequal dorsal arms generally four to six times longer than the mantle.
It has the common name algae octopus due to its typical resting camouflage, which resembles a gastropod shell overgrown with algae. It is small in size with a mantle around the size of a small orange ( c. 7 cm or 3 inches) and arms 25 cm (10 inches) in length, and is adept at mimicking its surroundings.
Sailors cleaning a ship near St. Ilona Island and Cape Nigra were attacked by a giant squid; two were pulled into the deep, and a third later died from injuries sustained during the attack. One of the squid's arms, severed during the attack, was 7.5 meters (25 ft) in length; the full arm was estimated to be 10 meters (33 ft).