Onchidoris bilamellata, Gloucester, MA, Photo: Rick Stuart-Smith
Max Size: 4 cm
Sea Temperature Range: -0.2-18.2°C
IUCN Threat Status: Not Evaluated
Occurrence: Infrequent (4% 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: Few (5 per transect)
Abundance is calculated as the average number of individuals recorded per RLS transect, where present.