Checkered Nerite or Common Nerite
Phylum: Mollusca, Class: Gastropoda, Order: Cycloneritida, Family: Neritidae, Genus: Nerita, Species: Nerita tessellata · Neritidae (Nerite family) · Gastropod, whole shell, globose or rounded shape
Species
Nerita tessellata
Shell Type
Gastropod, whole shell, globose or rounded shape
Family
Neritidae (Nerite family)
Size
Approximately 0.5 inches (12-15 mm) in width, which is typical for an adult of this species. Adults generally range from 10 to 20 mm.
Color & Pattern
The exterior exhibits a dark greyish-blue to nearly black base coloration with faint, intricate checkered or patterned markings characteristic of the species. A distinct pale whitish or cream-colored area is visible near the apex/spire region. The colors appear mostly natural and slightly weathered.
Rarity
Very Common
Habitat
Found in the intertidal zone, predominantly on rocky shores, limestone formations, and splash zones where they cling tightly to surfaces during low tide. They are marine animals.
Geographic Range
Tropical Western Atlantic, including southern Florida, the Bahamas, the Caribbean Sea, and south along the coast of Central and South America to Brazil.
Description
A small, robust, globose snail shell with a low spire and a thick, sturdy shell structure designed to withstand heavy wave action in intertidal zones. The surface features fine spiral striations and growth lines. The aperture is semicircular with a flattened columellar deck that often has small denticles on the inner lip.
Key Features
Globose rounded shape, low spire, dark gray to black coloration often with faint checkerboard patterns, flattened inner lip (columella) with tiny teeth, and thick, sturdy shell walls.
Collector Value
Low to moderate commercial value. While extremely popular and fun for beginner beachcombers to collect, they are too common to command high prices among advanced collectors, typically sold cheaply in bulk or souvenir shops.
Condition Notes
Good condition. The shell is intact with minimal surface wear, retaining its general shape and dark coloration, though showing slight weathering typical of intertidal drift.
Interesting Facts
Nerites are remarkably resilient gastropods capable of surviving out of water for extended periods by sealing their operculum tightly against moisture loss. They possess a strong radula used to scrape microscopic algae off rocks.
Ecological Role
Nerites play a vital ecological role as primary grazers in intertidal rocky shore ecosystems, controlling algal growth. They serve as a food source for various shorebirds, crabs, and carnivorous marine snails.
Similar Species
Nerita peloronta (Bleeding Tooth) and Nerita versicolor (Four-toothed Nerite). They can be distinguished by their larger sizes, distinct coloration patterns such as red teeth-like structures in the aperture, or more pronounced striping.
Beach Finding Tips
Search rocky intertidal zones, limestone rocks, and tide pools during extreme low tide. Look closely at crevices and high-tide drift lines where they tend to accumulate.