Diaulula sandiegensisRinged doris | San Diego dorid
Mantle colour ranges from white, yellow, orange, to dark brown. Chocolate brown ring-shaped spots are seen on the central dorsum only and spots do not extend to the outer mantle margin as seen in Diaulula odonoghuei which was once thought to be the same species. Both similar species overlap in range along the Pacific coast of North America. D. sandiegensis has the more restricted range of the two, found from Baja California to Barkley Sound, British Columbia.
Max Size: 10 cm
Sea Temperature Range: 12.2-21.4°C
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: Common (41.8% 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: Solitary (1 per transect)
Abundance is calculated as the average number of individuals recorded per RLS transect, where present.
Edit by: Jo Schmid