TylodinaTylodina is a genus of medium-sized sea snails or false limpets in the family Tylodinidae.SpeciesSpecies within the genus Tylodina include:Tylodina americanaTylodina corticalisTylodina fungina- Observed solitary, in pairs and aggregating in small groups in reefs around San Clemente Island, the southernmost Channel Islands off the coast of Southern California July 2015. ''Tylodina perversa''