Granite Limpet
NameGranite Limpet
Scientific NameSiphonaria gigas
Common NameGranite Limpet
FamilySiphonariidae
GenusSiphonaria
Speciesgigas
Geographic DistributionEastern Pacific Ocean, ranging from Baja California, Mexico, southwards along the coast of Central and South America to Peru, including the Galápagos Islands.
Habitatintertidal
Shell Shapeconical
Average Size (mm)Typically ranges from 70 to 120 mm (7-12 cm) in diameter, making it one of the larger limpet species.
Identifying FeaturesIts large size, conical shape, and particularly the irregular, wavy, or scalloped margin of the shell are key identifiers. The prominent dark central muscle scar on the pearly white interior is also a distinguishing characteristic.
Raritycommon
Author CitationSowerby I, 1825
Description
A large, robust marine gastropod shell, commonly known as the Granite Limpet. The shell is characterized by its conical, cap-like shape and a distinctive irregular, wavy, or scalloped margin. The interior surface, as shown in the image, is smooth and pearly white to bluish-white, featuring a prominent, often dark brown to black, kidney-shaped central muscle scar. The exterior, visible at the edges, is typically duller, mottled with shades of white, grey, and brown, and can be eroded or encrusted with other organisms. This species is well-adapted to high-energy intertidal environments.
