This National Oceanic and Atmospheric Administration publication lists 116 species of living and recently extinct marine mammals of the world. Included are 36 species of Order Carnivora (polar bear, sea otter, and 34 pinnipeds); 5 species of Order Sirenia; 10 of Order Mysticeti (baleen whales); and 65 species of Order Odontoceti (tooth whales). Living freshwater pinnipeds, sirenians and cetaceans are included. Information given for listed families, genera, and species is mostly limited to distribution and literature sources where the taxonomy is described. A list of generic and specific synomyms is also provided. This publication is part of a series of technical reports for the National Marine Fisheries Service. (MR)