Tylodina perversa

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Tylodina perversa, also known as the yellow tylodina or yellow umbrella slug, is a small sea snail that looks like a limpet. Its shell is limpet-like and made mostly of protein rather than calcium carbonate. It lives in the northeastern Atlantic, including waters around the British Isles and the Mediterranean Sea. It feeds on the sponge Aplysina aerophoba.

Taxonomy:
Kingdom Animalia; Phylum Mollusca; Class Gastropoda; Clade Euopisthobranchia; Family Tylodinidae; Genus Tylodina; Species T. perversa. Binomial name: Tylodina perversa (Gmelin, 1791).