The rhinophores each have a yellow tip and red band. The oral tentacles have a red line that connects across the front, and above that is a white line. The white line also runs along the foot. The ceratal cores are brown to black and the cerata are white or gold on the tips followed by a rose-pink band which fades at the base. Size to 50 mm.

Previously known as Phidiana pugnax. Aggressive species, attacks other nudibranchs.

Low intertidal and subtidal to 35 m; Pillar Point, San Mateo County, California to Isla Cedros, Baja California, Mexico.