Discodorididae, Bergh, 1891

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 : 112-113

Discodorididae

Carminodoris bramale (Fahey and Gosliner, 2003) . Playa Pichilingue , La Paz, Baja California Sur, Mexico, 12 specimens, up to 75 mm long, with egg ribbons, on and near encrusting yellow sponge on the underside of low intertidal cobbles in the outlet of the lagoon behind the playa, 27 December 2017 (observed by JG; for images see: <https://www.inaturalist.org/observa tions/9332510>) to Isla de Coiba, Panama ( Hermosillo 2004 [as Hoplodoris bramale ]) .

Previous northernmost locality: La Cruz de Huanacaxtle, Bahía de Banderas, Mexico ( Hermosillo 2006).

Remarks: The specimens from La Paz are the first record of C. bramale from the Gulf of California and the Baja California peninsula. It was not recorded by Angulo-Campillo (2005) during his four year survey of opisthobranchs from Baja California Sur, including the La Paz area.

Thordisa rubescens Behrens and Henderson, 1981 . Northeast Santa Cruz Island , California, 1 specimen, 15 m depth, 1 November 2017 ( Figure 1D ), observed by David Kushner, Kenan Chan, and Joshua Sprague (D. Kushner, personal communication to JG, 13 November 2017) to Punta Eugenia, Baja California Sur (Bertsch et al. 2000).

Previous northernmost locality: Paradise Cove, Malibu, Los Angeles Co., California (Behrens and Henderson, 1981) .

Remarks: The specimen from Santa Cruz Island appeared to be dull orange to rust colored, but had the distinctive “halos” of lighter pigment around the rhinophores and gill plume described by Behrens and Henderson (1981) for this species ( Figure 1D ).

Few specimens of this Californian species have been found since its original description ( Behrens 2016), so it is noteworthy that “dozens” have been observed, including some mating and laying eggs, the past two years on subtidal reefs around the Palos Verdes Peninsula (P. Garner, personal communication to RA, 20 June 2018; and see <https://www.inaturalist.org/taxa/50139 -Thordisa-rubescens>).

Although Behrens and Henderson (1981) reported finding one specimen off the Palos Verdes Peninsula, the other three specimens they listed all came from “Big Kelp Reef, Paradise Cove, Los Angeles Co.,” and the geographic coordinates they gave for that site place it in Malibu , not Palos Verdes as implied in Behrens and Hermosillo (2005) .

Figures

FIGURE 1. Heterobranch sea slugs found at new northernmost localities in the Northeastern Pacific Ocean, 2015–2017. A Okenia angelensis, Miwok Beach, Sonoma Co., California, 27 May 2017. Image by Colby Davidson. B Acanthodoris rhodoceras, Chup Point, Barkley Sound, Vancouver Island, British Columbia, 21 May 2018. Image by Peter Mieras/subvisionproductions.com. C Polycera atra, Lemmens Inlet, Clayoquot Sound, Vancouver Island, British Columbia, 25 July 2015. Inset: tail. Images by Brandon Exner. D Thordisa rubescens, Santa Cruz Island, California, 1 November 2017. Image by Kenan Chan/Channel Islands National Park.