Calliostomatidae
The Calliostomatidae are a family of sea snails, marine gastropod mollusks in the superfamily Trochoidea. These snails are commonly known as top snails or topshells. They are characterized by their distinctive, usually conical, shell shape, and they are often brightly colored.
Characteristics
Calliostomatidae are generally small to medium-sized snails, typically ranging from a few millimeters to several centimeters in diameter. The shell is usually conical, sometimes with a pointed apex, and is often ornamented with ribs, spines, or other sculpturing. The shell is generally smooth and glossy, often with a variety of colors and patterns. The aperture of the shell is usually circular or oval, and it may be bordered by a thickened lip. The operculum, a protective structure that covers the opening of the shell, is typically calcareous and has a spiral shape.
Habitat and Distribution
Calliostomatidae are found in a variety of marine habitats, including rocky shores, coral reefs, and deep-sea environments. They are widely distributed throughout the world's oceans. They are generally herbivores, grazing on algae and other plant matter.
Notable Members
The family Calliostomatidae includes a number of well-known and popular species, including:
- Calliostoma zizyphinus, the "common topshell," is a popular food source in some regions.
- Calliostoma euglyptum, a brightly colored species found in the Pacific Ocean, is popular among shell collectors.
- Calliostoma bairdii, a deep-sea species, is known for its distinctive, spiny shell.