Macroschisma hiatula
NameMacroschisma hiatula
Scientific NameMacroschisma hiatula
Common NameKeyhole limpet
FamilyFissurellidae
GenusMacroschisma
Specieshiatula
Geographic DistributionIndo-Pacific region, including areas such as Australia (Queensland, New South Wales), New Caledonia, and Japan.
Habitatintertidal
Average Size (mm)Up to 25-30 mm in length.
Identifying FeaturesThe most distinguishing feature is the very long, narrow, anterior slit (keyhole) that can extend almost half the length of the shell. The shell surface displays fine radial ribs and concentric growth lines, giving it a somewhat sculptured appearance.
Raritycommon
Author CitationSwainson, 1840
Description
A small to medium-sized keyhole limpet shell, characterized by its elongate-oval, cap-like shape and a distinctive, long, narrow slit located anteriorly. The shell exhibits a whitish to cream background adorned with irregular reddish-brown or purplish-brown patterns.
