Squid are remarkable ocean predators. These invertebrates (animals without backbones) are molluscs, just like snails, but they do not have protective outer shells. They have a tube-shaped body and a small, rod-like internal shell called a pen.

Is a squid an invertebrate?

Octopus and squid belong to a group of marine invertebrates known as cephalopods. Cephalopod means 'head-footed' – the arms and tentacles are derived from the head. Their closest relatives are snails, slugs, chitons and shellfish, collectively known as molluscs.

Do squid have bones?

Squid are members of the phylum Mollusca, which contains invertebrate animals. They do not have spinal cords or bones. Squids are cephalopods, which means that have their arms attached to their heads.