This volume is a comprehensive, fully illustrated Catalogue of the Deep-sea Batoids and Chimaeras of the Indian Ocean, encompassing FAO Fishing Areas 51 and 57, and that portion of Area 47 off South Africa from about 18° 42'E to 30° 00'E. The present volume includes 4 orders, 10 families, 28 genera, and 78 species of batoid and chimaera-like fishes occurring in the Indian Ocean Deep-sea. The Catalogue includes a section on standard measurements for batoids and chimaeras with associated terms. It provides accounts for all orders, families, and genera and all keys to taxa are fully illustrated. A species representative of each genus is also provided and includes: valid modern names and original citation of the species; synonyms; the English, French, and Spanish FAO names for the species; a lateral view and often other useful illustrations; field marks; diagnostic features; distribution, including a GIS map; habitat; biology; size; interest to fisheries and human impact; local names when available; a remarks sections; and literature. The volume is fully indexed and also includes sections on terminology and measurements including an extensive glossary, a list of species by FAO Statistical Areas, a glossary, and a dedicated bibliography.