5cm long. Low intertidal, Main Beach, Laguna Beach, Orange County, CA. 12/22/07. © Sandy Dildine

Yellow Umbrella Slug
(Sidegill Slug)

Tylodina fungina

Notaspidea: Tylodinidae

Native to Southern California and Galapagos Islands

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Feeds exclusively on the sponge Aplysina fistularis. Crystal Cove State Park, Laguna Beach, Orange County, CA. 12-13-16. © Timothy Arehart

Crystal Cove State Park, Laguna Beach, Orange County, CA. 12-13-16. © Timothy Arehart

Showing the "Sidegill".11/13/2016. © Timothy Arehart

Showing the "Sidegill".11/13/2016. © Timothy Arehart