Acmaea mitra

Whitecap limpet | Duncecap limpet
Acmaea mitra
Acmaea mitra, British Columbia, Canada, Photo: Em Lim



Shell is white but often coated in encrusting coralline algae. This limpet is diagnostically tall and conical, and the apex is skewed slightly anterioirly from the centre of the shell. 


Max Size: 4 cm

Sea Temperature Range: 5.3-16.7°C

Depth: N/A

Habitat Generalization Index: N/A

Also referred to as the SGI (Species Generalisation Index), this describes the habitat niche breadth of the species. Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most hard substrates within their range (generalists). Learn more here.

Conservation and Rarity

IUCN Status: Not Evaluated

Occurrence: Widespread (69.0% of sites)

Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed

Abundance: Many (13 per transect)

Abundance is calculated as the average number of individuals recorded per RLS transect, where present.