Elongated Keyhole Limpet
NameElongated Keyhole Limpet
Scientific NameFissurellidea megatrema
Common NameElongated Keyhole Limpet
FamilyFissurellidae
GenusFissurellidea
Speciesmegatrema
Geographic DistributionTemperate waters of the Southern Hemisphere, particularly along the coasts of South America (e.g., Chile, Argentina) and sometimes South Africa.
Habitatintertidal
Average Size (mm)Can range from 30 to 70 mm in length.
Identifying FeaturesIts highly elongated and flattened profile, combined with the exceptionally long and narrow, slit-like apical opening, are its most distinguishing characteristics. Fine concentric growth lines and subtle radial ribbing are also present, along with characteristic reddish-brown markings.
Raritycommon
Author Citation(Sowerby, 1835)
Description
A distinctive, elongated keyhole limpet shell, characterized by its flattened, oval shape and a very long, narrow, slit-like apical opening. The exterior surface shows fine concentric growth lines and some radial sculpture, often adorned with reddish-brown or orange-brown speckles. The interior is smooth and typically white.
