Haliotis belongs to Mollusca. Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda. It is sluggish invertebrates, with a thin fleshy envelope or mantle covering the visceral organs. Molluscs include mussels, scallops, oysters, periwinkles, whelks, squid, clams, snails, haliotis and octopus.