Thyca
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| Thyca | |
|---|---|
 | |
| Shell of Thyca crystallina | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Family: | Eulimidae |
| Genus: | Thyca H. Adams & A. Adams, 1854 |
| Type species | |
| Pileopsis astericola A. Adams & Reeve, 1850 | |
| Synonyms[1] | |
| |
Thyca is a genus of small sea snails, marine gastropod mollusks in the family Eulimidae.[1] These snails are ectoparasites of starfish; they are relatively unmodified, the underside having become a suction disc with a central mouth that draws nourishment from the host's tissues.[2]