Janolus barbarensis (J. G. Cooper, 1863) Antiopella barbarensis, common name Santa Barbara janolus,[2] is a colourful sea slug, a cladobranch nudibranch, a marine gastropod mollusc in the family Janolidae.

[3][4][5] Antiopella barbarensis is a commonly found nudibranch on the Pacific coast inhabiting tide pools of La Jolla, California.

[6] Populations also expand to some parts of Costa Rica.

Behrens 1991 gives the distribution as "San Francisco Bay to Baja California, Gulf of California, Mexico".

[7]