An octopus does not have a shell at all, while calamari has a small internal flexible backbone called a pen. Like clams and oysters, octopus and calamari are mollusks (invertebrate sea creatures), classified as cephalopods, meaning “head-footed.” The ”arms,“ are connected to their heads, while the rest of the body is in front of the head.Ĭharacteristics: Cephalopods are physiologically similar to other mollusks, but the main difference is their lack of a shell.
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