This identification guide includes 56 species of macro (> 5 cm in diameter) jellyfishes (cnidarians, ctenophores, and thaliaceans) that are known to occur off the coast of West Africa. It provides fully illustrated dichotomous keys to all taxa, an illustrated glossary of technical terms for each main group, and species accounts including the scientific name, diagnostic features, colour, size, ecology, stinging, geographical distribution, and one or more illustrations. The guide is intended for both specialists, and non-specialists who have a working knowledge of biology.