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Phylum: Mollusca Mollusca A major phylum of the animal kingdom comprising an extreme diversity of external body forms (oysters, clams, chitons, snails, slugs, squid, and oc â¦ topuses among others), all based on a remarkably uniform basic plan of structure and function.
Squid are mollusks like clams and oysters but they have no shells on the outside of their bodies! They have a shell inside their bodies called a pen. There are about 375 species of squid. Squid have 10 arms. Two of their arms are longer than the other eight and are called tentacles. Squid range in size from under an inch to more than 60 feet in length! They have long, tubular bodies and little heads. Squid are very fast swimmers and use a kind of jet propulsion to move.