The octopus is the common name for 252 species of marine mollusks in 26 genera of the family Octopidae. It is the largest family of the Cephalopoda, which can be divided into the subfamily of deep-sea polypus octopuses, the subfamily of Aerodactylus octopuses, the subfamily of Tanaido octopuses, and the subfamily of Octopus octopus.

The muscles are strong, the opening of the outer coat cavity is narrow, and the surface of the body generally does not have water holes. The body is short ovoid, saccate, without fins; the head and carapace are not clearly demarcated, the head carcass of the octopus is about 7-9.5 centimeters, and the head has large compound eyes and eight contractible wrists.

We usually crawl with the wrists, sometimes by the intercarpal membrane stretch to swim, can strongly hold other things, with the lower part of the head of the funnel spraying water for rapid retreat.

Temperate mollusks, living underwater, adapted to the water temperature can not be lower than 7 ℃, the specific gravity of seawater 1.021 is the most appropriate, low salinity environment will die. Can feed on large animal plankton and grow.

The octopus can not only six times in a row to the outward spray of ink, but also like the most flexible chameleon, change their own color and structure, become as a rock covered with algae, and then suddenly pounced on the prey, and the prey simply do not have the time to realize what is happening.

Expanded:

Octopuses are known to reproduce. p>Octopus reproduction:

Octopus in the ocean breeding time is generally concentrated in the spring and fall, spring and fall seawater temperature of about 16 ℃.

The octopus likes to spawn in the conch shell, so the rope can be threaded through the red conch shell sunk to the bottom of the sea, extracted on time to catch. Autumn and winter often burrow in the deeper sea sediment.

Octopus dioecious. The male has a specialized wrist, called the stem wrist or handing wrist, used to put the sperm packet directly into the female's coat cavity.

Whenever the breeding season, the female octopus lays eggs, about 0.3 centimeters long, totaling more than 100,000, under rocks or in caves.

During incubation the female guards the eggs, using a suction cup to get them clean and stirring them with water.

Female octopuses lay their eggs all at once requiring the young to hatch 4-8 weeks later. The juvenile octopus is shaped like an adult but small, and after hatching it needs to drift with the plankton for a few weeks before sinking to the bottom and hiding.

Baidu Encyclopedia - Octopus