The octopus belongs to the mollusks.

Octopus is a common marine mollusks, also known as octopus, octopus, octopus, octopus, etc., in the biological classification belongs to the animal kingdom, mollusc phylum, cephalopods, octopus, octopus family of mollusks collectively, the whole world about **** there are 26 genera in 4 subfamilies 252 species, widely distributed in the Pacific Ocean, the Indian Ocean, the Atlantic Ocean, the tropics, subtropics, and temperate sea areas.

Morphological features

Octopus body is short ovoid, saccate, no fins, head and carapace demarcation is not obvious, the head has a large compound eye and eight contractible wrist, each wrist has two rows of fleshy suckers, wrist base and webbed tissue connected to the center of the mouth, the mouth has a pair of sharp horny palpi and filet teeth tongue, the surface of the body is smooth, with very fine pigmented punctation.

HabitsHabits

1, the environment: the octopus is a temperate mollusks, the lowest water temperature can not be lower than 7 ℃, in the low-salinity environment will be dead, a variety of vessels into a maniacal hobby, the most eager to hide in the hollow vessels, when in danger, it will be spewed out of the ink cover to escape.

2, food: octopus is a carnivorous mollusks, mainly to valvular gill animals and shrimp, crabs and other crustaceans for food, often with lobsters and lobsters to fight you to death, the purpose is to compete for astaxanthin, astaxanthin is to ensure that the octopus in the deep sea survival of the necessary conditions.

3, mimicry: octopus can escape from the enemy through mimicry, thanks to the octopus body surface is distributed with a large number of pigment cells, the use of pigment cells can be mimicked as a sea serpent, lionfish, etc., to avoid predators, but also camouflaged as sandy seabed, black cracks in the rock, etc., to capture prey.

4, reproduction: octopus dioecious animals, males have a specialization of the copulatory wrist, used to put the sperm packet directly into the female's coat cavity, the female spawns under the rocks or in the hole, the female guards the eggs during incubation, the larvae generally 4 to 8 weeks after hatching.