Thyca
Thyca is a genus of small sea snails, marine gastropod mollusks in the family Eulimidae. 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.
Description
The conical shell is longitudinally grooved, transparent and slightly curved.Species
Species within the genus Thyca include:Thyca astericola Thyca callista Berry, 1959Thyca crystallina Thyca ectoconcha P. Sarasin & F. Sarasin, 1887Thyca hawaiiensis Warén, 1980Thyca lactea Thyca nardoafrianti Thyca sagamiensis Thyca stellasteris Koehler & Vaney, 1912;Species brought into synonymy:Thyca pellucida Kükenthal, 1897: synonym of ''Thyca crystallina''