Janolus barbarensis (Cooper, 1863)
The body of this species resembles an aeolid, as it is covered with cerata. Gosliner (1992) changed the name from Antiopella to Janolus and recognized an extremely similar and often confused, previously synonymized species Janolus fuscus (O'Donoghue, 1924) as separate and distinct. These two janolids differ in that in J. barbarensis the digestive gland within the cerata are irregularly branched. J. barbarensis is the more southern of the two species, being found from San Francisco Bay, south to Bahia San Quintin, Baja California and in the Gulf of California (Behrens, 1991). The ranges of the two overlap between San Francisco Bay and San Luis Obispo, California. J. barbarensis is a real treat for the photographer, displaying spectacular ceratal coloration, with its blue tips and subapical oraque yellow orange band.
Above specimen collected by Don Cadian in boat docking area measured almost 82 mm!
David W. Behrens
Pacific Coast Nudibranchs
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