Apr 13, 2012

Common octopus (Octopus vulgaris)

Did you know?

That the common octopus is the most intelligent invertebrate animals and can compete even with mammals in solving problems? The common octopus has three hearts and nine brains? The largest animal is a cephalopod invertebrates, called colossal squid (Mesonychoteuthis hamiltoni) weighing 495 kg? That cephalopods have blue blood?

The common octopus is about 25 cm long, with arms about 1 m long. Some forms may reach 3 m in total length. The 8 tentacles or arms each have two rows of suckers, the side arms are longer. Membrane connects the arm bases. The ventral siphon is important for swimming by jet propulsion, while crawling on the ground by means of the arms is also a common form of locomotion. No other shell that makes the common octopus so extremely flexible: it can penetrate through narrow cracks and small holes. The eyes have well developed lenses, the skin may change color and making it an effective camouflage. 

If the octopus is attacked, it may expel ink to confuse his enemy. This ink is produced by the accessory glands of the gut that is stored in an ink sac. Their diet consists of crustaceans (crabs and lobsters), as well as mollusks (clams and snails). The Octopus hunting at night and can tear its prey with its beak jaw type. Octopuses are solitary and only come together for reproduction. There, for an hour, males transferred more spermatophores (packets of sperm) with a modified arm to the mantle cavity of the female. The female produces 120,000 to 400,000 eggs that are tied into piolines to the walls of a cavity in shallow water. During the next 25 to 65 days (depending on water temperature) the female guards the eggs and feeds. It usually dies once the planktonic paralarvae have emerged. The common octopus has a rather short life of 12 to 18 months.

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