The term 'squid-like mollusc' refers to a type of marine creature known as a cuttlefish. Cuttlefish are cephalopods, meaning they have a distinct head and foot, and they are closely related to squid and octopuses. They have a unique internal shell, which is made of calcium carbonate and helps them to control their buoyancy in the water. Cuttlefish also have eight arms and two tentacles, and they use these to capture prey. They are found in tropical and temperate waters around the world.