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Squid is a group of large cephalopod animals or types of mollusks living in the ocean. The name '' Cephalopoda '' in Greek means "head of the head", this is because of the legs separated into a number of hands that encircle the head.Like all cephalopods, the squid are separated by having different heads. Large axons of this squid have a diameter of 1 mm. Cuttlefish is widely used as food.
Squid is one of the animals in the invertebrate class (not in the backbone).
One type of deep-sea squid, '' Heteroteuthis '', is that which has the ability to emit light. The light-emitting organ lies at the tip of a long, protruding long jutting forward.This is due to the lumination events that occur in this type of squid.Heteroteuthis sprayed large amounts of luminous fluid whenever it was disturbed, this process was the same as the ordinary squid that sprayed ink.
All squid have pipe-shaped bodies, perfectly developed heads, and ten long hands with succulent bowls.These hands are useful for ensnaring the prey and then tearing using their strong jaws, similar to the beak's beak.The squid sucks water through its central body cavity, the mantle cavity, and forces it out through a flexible vessel called a chiffon.Chiffon is located just behind the hand. Because of the jets of water that push the squid to swim backward.
The squid fins are two extensions of the mantle like the lobe that is used as the steering wheel of his movement.
His eyes do not have eyelids, but look like human eyes.
The squid has three hearts and is blue-blooded. [6] Two of their hearts are located close to each of its gills and because of that they can pump oxygen to the resting part of the body easily.Cuttlefish have a principal respiratory system of copper compounds, in contrast to humans in which humans have an iron-based respiratory system, which results if it is too close to a surface where there is hot water, the squid can die easily because it is weak.
Many squid can change their body color from brown to purple, red or yellow as camouflage to avoid the threat of predators.