How to Distinguish from Similar Species: This species is very similar to Dialula sandiegensis and, according to some keys, would be keyed as that species. However, it has spots rather than rings on the dorsum. In my experience there is a range of phenotypes in this group of nudibranchs from solid spots through spots with pale centers to rings; so it may be part of a species complex or the same species as D. sandiegensis.
Geographical Range: Vancouver Island, BC Canada to Bahia de San Qintin, Baja California, Mexico
Biology/Natural History: Feeds on sponges such as Halichondrea panacea, Myxilla incrustans, and Adocia gellindra.
Kozloff 1987, 1996
Smith and Carlton, 1975
General Notes and Observations: Locations, abundances, unusual behaviors:
Authors and Editors of Page:
Dave Cowles (2005): Created original page