Rough Keyhole Limpet
NameRough Keyhole Limpet
Scientific NameDiodora aspera
Common NameRough Keyhole Limpet
FamilyFissurellidae
GenusDiodora
Speciesaspera
Geographic DistributionEastern Pacific Ocean, ranging from Alaska south to Baja California, Mexico.
Habitatintertidal
Shell Shapeconical
Average Size (mm)60
Identifying FeaturesKey identifying features include the prominent keyhole-shaped apical opening, the rough and heavily sculptured shell surface with strong radial ribs, and the mantle of the living animal which extends over the shell margin with numerous papillae. The overall shape is a low, oval cone.
Raritycommon
Author Citation(Rathke, 1833)
Description
The Rough Keyhole Limpet is a marine gastropod characterized by its low, conical, oval shell with a distinctive keyhole-shaped apical opening. The shell exterior is heavily sculptured with strong, often nodulose radial ribs and concentric growth lines, giving it a rough texture. The living animal's mantle is typically pale, often yellowish or cream, and extends over the shell margin, bearing numerous papillae or projections that contribute to its 'rough' appearance. The foot is broad and muscular, adapted for clinging to hard substrates.
