GODDARD ET AL.: EL NINO IMPACT ON HETEROBRANCH SEA SLUG RANGES 119 
Figure 3. Nudibranch sea slugs found at new northern localities in the Northeastern Pacific Ocean, 2015-2017. A Her- 
mosita hakunamatata. La Bocana, Bahia de Magdalena, Baja California Sur, Mexico, 1 September 2015. Image by CH. B 
Phidiana hiltoni, Dillon Beach, California, 30 April 2017. Image by DM. C Taringa aivica. Mission Bay, San Diego, Cal¬ 
ifornia, 14 June 2018. Image by CH. D Diaphoreolis lagunae, Whiskey Creek, Curry Co., Oregon, 19 May 2017 (grid 
squares 2 mm on a side). Image by NT. 
sources document the occurrence from the 1940s through 1970s of nearly 50 species of hetero- 
branchs from the outer coast of northern Marin and Sonoma counties, and Phidiana hiltoni is not 
among them. 
II. Additional species, at or near previous northernmost localities 
In addition to the species listed above, 24 more were found in 2016 or 2017 at or near 
previously determined northernmost range limits. Four of these (Aplysia californica, Aplysia 
vaccaria, Flabellina cooperi, and Flabellinopsis iodinea) were found farther north in 2015-17 than 
in 2014-15 as reported by Goddard et al. (2016), and are documented individually below, along 
