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Tylodina fungina Gabb, 1865
Yellow False Limpet aka Yellow Umbrella Slug
Tylodina fungina occurs from Cayucos, California and all through southern California to the Galapagos Islands, where it is most often found on its prey, the yellow sulfur sponge, Aplysina fistularis. Specimens can reach about 30 mm in length. Tylodina's shell is covered with a bristled mantle and the rhinophores are rolled. Specimens have varying degrees of brown coloration on the mantle.
TylodinidaeTylodina funginaTylodinamollusksgastropodsmolluscagastropodasnailsrocky reefscalifornia underwatercalifornia wildlifeYellow Umbrella Slug
From Catalina Island -- Peace Dive Boat -- June 2013