Mauve-mouth Drill
NameMauve-mouth Drill
Scientific NamePteropurpura trialata
Common NameMauve-mouth Drill
FamilyMuricidae
GenusPteropurpura
Speciestrialata
Geographic DistributionEastern Pacific Ocean, specifically along the coast of California, USA, and Baja California, Mexico.
Habitatintertidal
Shell Shapefusiform
Average Size (mm)20-50 mm (The specimen in the image appears to be on the smaller side, likely around 25-35 mm).
Identifying FeaturesElevated spire, prominent axial ribs, often three wing-like varices per whorl (though sometimes eroded), distinct siphonal canal, and the diagnostic pale pink to mauve coloration within the aperture. The shell surface can be rough due to sculpture.
Raritycommon
Author CitationSowerby, 1834
Description
The Mauve-mouth Drill (*Pteropurpura trialata*) is a predatory marine snail known for its distinctive shell. It features an elevated spire, prominent axial ribs, and often three wing-like varices per whorl, though these can be less pronounced or eroded in some specimens. The shell's exterior is typically off-white to pale cream, while its common name derives from the characteristic pale pink or mauve coloration found within the aperture. This species is a carnivore, preying on other mollusks and barnacles.
