Tylodina perversa

Tylodina perversa, common names the "yellow tylodina" or "yellow umbrella slug", is a species of sea snail or false limpet, a marine opisthobranch gastropod mollusk in the family Tylodinidae.

Tylodina perversa
A live individual of Tylodina perversa, head end towards the top
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Clade:	Euopisthobranchia
Family:	Tylodinidae
Genus:	Tylodina
Species:	T. perversa
Binomial name
Tylodina perversa (Gmelin, 1791)

This opisthobranch has a limpet-like shell which is composed primarily of protein, not calcium carbonate.

Distribution

This species of false limpet occurs in the northeastern Atlantic including the British Isles and the Mediterranean Sea.

Ecology

T. perversa feeds on the sponge species Aplysina aerophoba.

• 
  Tylodina perversa on the Aplysina aerophoba, in Ližnjan, Croatia
• 
  Spiral egg ribbon of the Tylodina perversa, in Ližnjan, Croatia
• 
  Close-up of the Tylodina perversa, in Ližnjan, Croatia