Dyson's Keyhole Limpet
NameDyson's Keyhole Limpet
Scientific NameDiodora dysoni
Common NameDyson's Keyhole Limpet
FamilyFissurellidae
GenusDiodora
Speciesdysoni
Geographic DistributionWestern Atlantic Ocean, including the Caribbean Sea, Gulf of Mexico, and coastal areas from Florida (USA) south to Central America and northern South America.
Habitatintertidal
Shell Shapeconical
Average Size (mm)15-25
Identifying FeaturesThe most prominent identifying feature is the keyhole-shaped apical opening (foramen). Other features include strong radial ribs intersected by concentric growth lines, creating a cancellate sculpture; a crenulated shell margin; and a characteristic color pattern of greenish-yellow, white, and reddish-pink, often with a distinct red apical patch.
Raritycommon
Author Citation(Reeve, 1850)
Description
Dyson's Keyhole Limpet (*Diodora dysoni*) is a small, conical marine gastropod shell characterized by its distinctive keyhole-shaped apical opening. The exterior surface is heavily sculptured with numerous radial ribs and concentric growth lines, giving it a textured, somewhat corrugated appearance. Its coloration is a striking mix of greenish-yellow, off-white, and reddish-pink or orange-brown, often with a prominent red patch at the apex. The shell margin is crenulated, reflecting the external ribbing. The interior is smooth and white, with a darker rim around the foramen.
