Fissurella nigra
NameFissurella nigra
Scientific NameFissurella nigra
Common NameBlack Keyhole Limpet
FamilyFissurellidae
GenusFissurella
Speciesnigra
Geographic DistributionEastern Pacific Ocean, ranging from central California to Baja California, Mexico.
Habitatintertidal
Shell Shapeconical
Average Size (mm)30-70
Identifying FeaturesThe most distinguishing feature is the elongated, oval apical opening (keyhole) at the top of the shell. The overall dark coloration and limpet-like, conical shape are also characteristic.
Raritycommon
Author CitationSowerby, 1835
Description
A dark, oval, limpet-like shell with a prominent, elongated apical opening, commonly known as the Black Keyhole Limpet. The exterior surface is typically smooth but may show subtle concentric growth lines. The shell is held in a hand, suggesting a size of several centimeters, and the background indicates a marine or intertidal environment.
