Numbering nearly ten thousand species, Foraminifera constitute the most diverse group of shelled microorganisms in the ocean. They are also one of the most valuable tools for environmental assessment and monitoring programs. This guide by Jean-Pierre Debenay provides a description of the environmental conditions around New Caledonia, an accessible introduction to Foraminifera, and a summary of the research that has been carried out from the island nation. It also describes more than one thousand species of Foraminifera collected around New Caledonia, accompanying each entry with SEM micrographs and notes on its distribution. Organized into groups to make it easy to identify each species, it will be a practical reference.