Cellana exarata, common name the "black foot opihi", is a species of edible true limpet, a marine gastropod mollusc in the family Nacellidae, one of the families of true limpets.
This species is endemic to the islands of Hawaii.
This limpet lives in the splash zone, higher up in the intertidal zone than Cellana sandwicensis.
Both the shell and the foot of the animal are black in color.
This species is used as a food item. It is considered not as high a quality food as the yellow foot ophi, Cellana sandwicensis.