What is the difference between cuttlefish and squid?

They all belong to cephalopods, and their differences are:

Squid, also known as soft fish and squid, is an eye-opening suborder of Cephalopoda.

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Squid, also known as cuttlefish, squid or cuttlefish, is a cephalopod among mollusks. Unlike squid, squid has a boat-shaped calcareous hard sheath.

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Press the middle of the carcass with your fingers. If it feels hard, it is squid. If it is soft, it is squid. Because squid fish have cuttlefish bones as hard as a ship, but squid only has a leaflike transparent film across its body, so it feels different. In addition, squid is generally slender, with a long diamond-shaped end and fleshy fins on both sides of the heir. When viewed upside down, they look like a "javelin head", while squid fish are slightly shoulder-width, which is different from other characteristics of squid.

There are two kinds of common squid in the market: long and oval. The long one is dried squid, and the oval one is dried squid, which is better than the oval one in quality. Good squid meat is thick, dry, reddish and mildew-free. The tender squid is yellowish in color, transparent and thin in skin. The old squid is purple in color and large in size.