Arcuate Keyhole Limpet
NameArcuate Keyhole Limpet
Scientific NameDiodora arcuata
Common NameArcuate Keyhole Limpet
FamilyFissurellidae
GenusDiodora
Speciesarcuata
Geographic DistributionIndo-Pacific region, including areas such as the Philippines, Indonesia, and other tropical Pacific waters.
Habitatintertidal
Shell Shapeconical
Average Size (mm)15-30
Identifying FeaturesConical, elevated shell with a slightly arched profile; prominent and numerous radial ribs of varying strength; a crenulated or scalloped shell margin; and, as a keyhole limpet, an apical opening (foramen) at the top of the shell (though not visible in this view).
Raritycommon
Author Citation(Sowerby I, 1835)
Description
A conical, limpet-shaped shell with a distinct arcuate profile, characterized by numerous prominent radial ribs of varying thickness. The shell is typically off-white to pale cream, often with subtle darker markings along the ribs. It belongs to the family of keyhole limpets, which possess an apical opening (keyhole), though not clearly visible in this image.
