The crustaceans of the island of Réunion have invaded rivers, land and they are ubiquitous in the sea. From the shoreline to ocean depths, they have proliferated and specialized into an incredible variety of shapes and sizes. Many of them have fascinating coloration that an increasing number of divers and photographers are trying to capture on photographs taken at night. This book is the first illust arated and documented inventory of the crustacean fauna of Réunion. A total of 483 species of crabs, shrimps, lobsters, anomurans and mantis shrimps are reported, including 64 new records for the island! Every passionate naturalist will find help for the identification of the species in the book, with approximately 180 species illustrated in colour and presented by habitats. The specialists will find a history of the main sampling events, a zoogeographical analysis and an updated inventory with the associated bibliography. The book will also be useful to managers of marine protected areas, given the particularly fragile equilibrium at Réunion.