Description: Body usually 25-40 mm, can be 80 mm. Whitish to light yellow. Narrow band of yellow around margin and tips of tubercles are bright yellow. Has bipinnate gills, numbering six. Dorsum feels warty and gritty to touch, due to spicules.
Geographical Range: Vancouver Island (British Columbia) to Punta Eugenia (Baja California)
Depth Range: Low-intertidal zone and subtidal to 45m
Habitat: Common under rocky ledges with sponges and tunicates
Biology/Natural History: Feeds on sponges, including Halichondria panicea, Myxilla incrustans, and Higginsia sp.
According to Baltzley et al., (2011), many gastropods, including this species, have a special network of pedal ganglia in their foot which assists in crawling. The two main neurons involved produce pedal peptides which elicit an increase in the rate of beating of cilia on the foot, resulting in crawling.