Tonicellidae
Tonicellidae is a family of marine snails, gastropods in the superfamily Trochoidea. This family has only one genus, Tonicella, which contains about 20 species.
Common Names
Common names for Tonicellidae include "limpets" and "keyhole limpets." These names are often used for other limpet species, but specifically refer to members of this family.
Characteristics
Tonicellidae have several distinctive features that set them apart from other limpets:
- Shell shape: Their shells are typically conical and somewhat flattened, with a distinctive keyhole-shaped opening near the apex. This opening is called the "anal slit" and functions as an outlet for waste.
- Size: Tonicellidae are relatively small limpets, generally measuring 1–3 cm in length.
- Coloration: The shells are typically gray or brown with dark streaks or patterns.
- Foot: They have a large, muscular foot that allows them to adhere strongly to rocks and other substrates.
Environment
Tonicellidae are found in intertidal and subtidal zones in various parts of the world, primarily in cold-water environments. They are commonly found clinging to rocks, algae, and other hard surfaces. These snails prefer areas with strong currents and wave action, which help them obtain food and avoid predators.