squid
cephalopod order
any of numerous 10-armed cephalopods (order Teuthoidea) found in both coastal and oceanic waters. Squids may be swift swimmers or part of the drifting sea life. They range in size from about 1.5 centimetres (less than 3/4 inch) to more than 20 metres (more than 65 feet), including the tentacles.Squids have elongated tubular bodies and short compact heads. Two of the 10 arms have developed into long slender tentacles with expanded ends and four rows of suckers with toothed, horny rings. The body of most squids is strengthened by a feathery-shaped, internal shell composed of a horny material. Squid eyes, almost as complex as human eyes, are usually set into the sides of the head.
Little is known of the life history of squids. Some attach their eggs to floating weeds and others to the ocean bottom. In some species the young resemble the adults at hatching; in others there is a planktonic larval stage.
The luminescent squids bear numerous light organs, which may be for recognition and for attracting prey.
Squids are numerous in the sea and serve as food for many animals, including the sperm whale, bony fishes, and man.
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