Soft-bodied, shell-less, marine slug (gastropod) invertebrates (molluscs) that shed their shells after larval stage. The word “nudibranch” comes from Latin word, nudus, meaning naked, and Greek term, βραγχια,
brankhia, meaning gills. Casually called sea slugs as they’re a family of opistobranchs (sea slugs) with the phylum Mollusca (molluscs). Often noted for their brilliant colours and striking forms with numerous colourful nicknames to match. Currently, there are about 3,000 species of nudibranchs