East Pacific from Washington, USA to Baja California, Mexico (Behrens & Hermosillo, 2005).
Locality: Fitzgerald Marine Refuge, Moss Beach, San Mateo County, Mid-intertidal, California, USA, Pacific Ocean, 17 March 2007, Rocky tidepool in surgrass beds area. Length: 1.5 cm. Photographer: Ron Wolf.
This species has a characteristic pattern of cream white bands on the head tentacles and cerata. There is a dark purplish band about midway up the oral tenatcles and rhinophores. The ceratal digestive gland ranges from brown to green in colour except for the basal region which is often a reddish colour. There are some larger white spots on the body and a white band down the midline of the posterior foot. It grows to about 15 mm in length. Little is known of its biology.
MacFarland, F. M. (1966). Studies of opisthobranchiate mollusks of the Pacific coast of North America. Memoirs of the California Academy of Sciences, 6: 1-546, pls. 1-72.
Rudman, W.B., 2007 (March 22) Cuthona abronia (MacFarland, 1966). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/cuthabro