Calliostoma
（重定向自Top shell）
![](/Images/godic/202502/17/Calliostoma_ligatum_21645.jpg")
![](/Images/godic/202502/17/C._trotini1646.jpg")
![Drawing of a dorsal view of a living animal of Calliostoma bairdii dredged in the Atlantic Ocean at a depth of from 100 m to 1170 m.](/Images/godic/202502/17/Calliostoma_bairdii_drawing1646.jpg")
![Rare purple beaded specimen of Calliostoma supragranosum found subtidally in Southern California.](/Images/godic/202502/17/Calliostoma_supragranosum1646.jpg")
Calliostoma is a genus of small to medium-sized sea snails with gills and an operculum, marine gastropod molluscs within the family Calliostomatidae, the Calliostoma top snails (according to the taxonomy of Gastropoda by Bouchet & Rocroi (2005)). Previously this genus was placed within the family Trochidae. Calliostoma is the type genus of the family Calliostomatidae.