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– recent ( Octopus vulgaris) Kingdom: Phylum: Class: Subclass: (unranked): Superorder: Order: Octopoda, 1818 • • • Octopoida Leach, 1817 The octopus ( or ~ ) is a soft-bodied, eight- of the Octopoda. Around 300 are recognised and the order is grouped within the with, and. Like other cephalopods, the octopus is with two eyes and a, with its mouth at the centre point of the arms (which are sometimes mistakenly called '). The soft body can rapidly alter its shape, enabling octopuses to squeeze through small gaps. Psicologia Generale Anole Pdf File on this page. They trail their eight arms behind them as they swim.
The is used both for and for, by expelling a jet of water. Octopuses have a complex nervous system and excellent sight, and are among the most intelligent and behaviourally diverse of all. Octopuses inhabit various regions of the, including, waters, and the; some live in the and others. Most species grow fast, mature early and are short-lived. During breeding, the male uses a specially adapted arm to deliver a bundle of sperm directly into the female's mantle cavity, after which he becomes and dies. The female deposits fertilised eggs in a den and cares for them until they hatch, after which she also dies. Strategies to defend themselves against predators include the expulsion of, the use of and, their ability to jet quickly through the water, and their ability to hide.
All octopuses are, but only the are known to be deadly to humans. Octopuses appear in mythology as sea monsters like the of Norway and the of the, and probably the of. A battle with an octopus appears in 's book, inspiring other works such as 's. Octopuses appear in Japanese erotic art,. They are eaten by humans in many parts of the world, especially the and the Asian seas. Contents • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Etymology and pluralisation The term was derived from or ὀκτά-, a form of ( oktō, 'eight') and ( pous, 'foot'), used for example by (c.
605) for the common octopus. The standard form of 'octopus' in English is 'octopuses'; the Ancient Greek plural 'octopodes', has also been used historically. The alternative plural 'octopi' – which it is a '-word – is considered grammatically incorrect, but is used frequently enough to be acknowledged by the Merriam-Webster 11th Collegiate Dictionary and Webster's New World College Dictionary. The lists 'octopuses', 'octopi', and 'octopodes', in that order, calling 'octopodes' rare and noting that 'octopi' is based on a misunderstanding. (3rd Edition 2010) lists 'octopuses' as the only acceptable pluralisation, and indicates that 'octopodes' is still occasionally used, but that 'octopi' is incorrect. Anatomy and physiology Size. Giant Pacific octopus at Echizen Matsushima Aquarium, Japan.
It is considered to be the largest species. The (Enteroctopus dofleini) is often cited as the largest known octopus species. Adults usually weigh around 15 kg (33 lb), with an arm span of up to 4.3 m (14 ft). The largest specimen of this species to be scientifically documented was an animal with a live mass of 71 kg (156.5 lb). Much larger sizes have been claimed for the giant Pacific octopus: one specimen was recorded as 272 kg (600 lb) with an arm span of 9 m (30 ft). A carcass of the, Haliphron atlanticus, weighed 61 kg (134 lb) and was estimated to have had a live mass of 75 kg (165 lb). The smallest species is, which is around 2. Asura Kannada Movie Video Songs Free Download. 5 cm (1 in) and weighs less than 1 g (0.035 oz).