Diodora arnoldi
NameDiodora arnoldi
Scientific NameDiodora arnoldi
Common NameArnold's Keyhole Limpet
FamilyFissurellidae
GenusDiodora
Speciesarnoldi
Geographic DistributionEastern Pacific Ocean, ranging from Monterey Bay, California, south to Baja California, Mexico.
Habitatintertidal
Shell Shapeconical
Average Size (mm)Typically ranges from 15 to 30 mm in length.
Identifying FeaturesKey identifying features include the distinct oval apical foramen, the strong cancellate sculpture formed by intersecting radial ribs and concentric growth lines, and its conical, limpet-like shape. The crenulated margin is also characteristic.
Raritycommon
Author Citation(Pilsbry, 1891)
Description
A small to medium-sized keyhole limpet shell, conical in shape with a distinct oval-shaped apical foramen (keyhole). The shell surface is characterized by prominent radial ribs intersected by concentric growth lines, creating a finely cancellate (net-like) sculpture. The margin is typically crenulated due to the radial ribs. The specimen in the image shows a relatively low profile for a Diodora.
