Tritonidae, Martin, 1904

Goddard, Jeffrey H. R., Treneman, Nancy, Prestholdt, Tara, Hoover, Craig, Green, Brenna, Pence, William E., Mason, Douglas E., Dobry, Phillip, Sones, Jacqueline L., Sanford, Eric, Agarwal, Robin, McDonald, Gary R., Johnson, Rebecca F. & Gosliner, Terrence M., 2018, Heterobranch Sea Slug Range Shifts in the Northeast Pacific Ocean associated with the 2015 - 16 El Niño, Proceedings of the California Academy of Sciences 65 (3), pp. 107-131 : 115

Tritonidae

Tritonia myrakeenae Bertsch and Mozqueira, 1986 . Estero Bluffs State Park , San Luis Obispo Co., California, 3 specimens, among the octocoral Clavularia sp. under low intertidal cobbles, 29 April 2017 (observed by JG; for image see <h ttps://www.inaturalist.org/observations/6358562>) to Costa Rica and Panama ( Camacho-García et al. 2005).

Previous northernmost locality: Santa Barbara, California ( Behrens 1980).

Additional northern localities: Cave Landing , San Luis Obispo Co., 4 specimens, 27 May 2013; 1 specimen, 8 October 2014; 1 specimen, 9 March 2016 (observed by JG) ; Tarantula Reef, Jalama Beach , Santa Barbara Co., 1 specimen, 5 July 2012 ; 1 specimen, 2 February 2015 (observed by JG) ; Gaviota , Santa Barbara Co., 6 specimens, 7 May 2012 (observed by JG) ; Naples , Santa Barbara Co., 1186 specimens, October 2006 – April 2017 (observed by JG) .

Remarks: This diminutive tritonid, which has been by far the most abundant nudibranch at Naples, is usually found associated with the stoloniferous octocoral Clavularia sp. , on whose polyps it preys (for image see <https://www.inaturalist.org/observations/5396758>).