Diodora harrassowitzi
NameDiodora harrassowitzi
Scientific NameDiodora harrassowitzi
Common NameHarrassowitz's Keyhole Limpet
FamilyFissurellidae
GenusDiodora
Speciesharrassowitzi
Geographic DistributionSouthwestern Atlantic, primarily off the coast of Brazil (e.g., states of Rio de Janeiro, São Paulo, Santa Catarina).
Habitatintertidal
Shell Shapeconical
Average Size (mm)15-25
Identifying FeaturesKeyhole-shaped apical perforation, strong cancellate sculpture (grid-like pattern of radial ribs and concentric growth lines), conical shape with an oval outline.
Rarityrare
Author Citation(Ihering, 1927)
Description
A species of keyhole limpet, Diodora harrassowitzi, is characterized by its small to medium-sized, conical shell with an oval base. A distinctive keyhole-shaped apical perforation (foramen) is present at the apex. The shell surface displays a cancellate sculpture, formed by intersecting fine radial ribs and concentric growth lines, giving it a grid-like appearance. The shell is typically whitish to light grey, often with natural encrustations or algal growth, and the interior of the apical opening may show a reddish-brown tint.
