Gyriscus

Gyriscus is a genus of sea snails, marine gastropod mollusks in the family Architectonicidae, the staircase shells or sundials.

Species
Species within the genus Gyriscus include:
 * Gyriscus asteleformis Powell, 1965
 * Gyriscus hayashii Shikama, 1970
 * Gyriscus jeffreysianus (Tiberi, 1867)