Cocculiniform limpets live mostly in aphotic zones of deep-sea areas. In this environment, rather poor in organic nutritients, they have specialized in utilizing different odd food sources. The paper presents the list of all species included in the superfamilies Cocculinoidea Dall, 1882 and Lepetelloidea Dall, 1882. Data on their habitat, food preferences and distribution are also included. Adaptive features in cocculiniform limpets that permit them to assimilate organic nutritients of various origin are also discussed. It is suggested that some expanded parts in their alimentary tracts may be used as “fermentative chambers” in which symbiotic bacteria could change the unassimilable food particles into simple compounds absorbed by limpets.