Scientific expeditions to Île Clipperton, an uninhabited 6 km2 coral atoll in the eastern Pacific Ocean off the coast of Central America, were undertaken in 1994, 1998, 2005 and 2007 to investigate community compositions both on and around this uninhabited coral atoll. These studies have allowed a reevaluation of the molluscan biodiversity of the most isolated oceanic island of the tropical eastern Pacific (TEP). Prior to this current work, the last complete study (Emerson, 1994) listed a total of 92 mollusk species at Clipperton. The known molluscan taxa are herein significantly increased 210%, for a total of 285 species. This is assuredly an underestimate, especially for species inhabiting deeper water which has yet to be adequately sampled.
The majority of taxa are illustrated by photography and scanning electron microscopy. An inter-oceanic island biogeographic comparison and an annotated species list are included.