Checkered Nerite or Common Nerite
Phylum: Mollusca, Class: Gastropoda, Order: Cycloneritida, Family: Neritidae, Genus: Nerita, Species: Nerita tessellata · Neritidae (Nerite family) · Gastropod, whole shell, spiral shape
Species
Nerita tessellata
Shell Type
Gastropod, whole shell, spiral shape
Family
Neritidae (Nerite family)
Size
Approximately 0.75 inches (1.5 to 2 cm), which is typical for an adult Nerita tessellata. Adults generally range from 0.5 to 1 inch.
Color & Pattern
Cream to whitish base color decorated with distinctive dark brown or black checkering and spiral bands. The pattern shows a classic tessellated (mosaic-like) appearance. The colors appear slightly sun-bleached on the upper spire, typical of intertidal specimens.
Rarity
Very Common, frequently found clinging to rocks in the intertidal zone throughout its range.
Habitat
Found primarily in the upper intertidal and supralittoral zones on rocky shores, limestone cliffs, and mangrove roots, often exposed to crashing waves and intense sunlight. Marine to semi-terrestrial.
Geographic Range
Western Atlantic, including the Caribbean Sea, Gulf of Mexico, Florida Keys, and south along the coast of South America.
Description
A sturdy, globose marine snail shell with a low spire and a thickened, flattened inner lip (columella) adorned with small teeth. The exterior features pronounced spiral cords and a classic checkered pattern of dark markings over a light background, making it well-camouflaged against rocky substrates.
Key Features
Low spire, sturdy thick shell, flattened inner lip with small denticles (teeth) along the margin, and characteristic checkered or mosaic brown-and-white color patterns.
Collector Value
Low commercial value due to high abundance, but a staple species for beginner shell collections and educational displays. Usually valued at less than a dollar per specimen.
Condition Notes
Fair to Good condition. The shell is structurally intact with minor wear on the spire from wave action and sun bleaching. Collectibility grade is Good.
Interesting Facts
Nerites are remarkably resilient to desiccation and can survive out of water for extended periods by sealing their operculum tightly. They graze on microscopic algae using a ribbon-like radula.
Ecological Role
Plays an important role in intertidal ecosystems as an algal grazer, controlling microalgae growth on rocks. Serves as a food source for shorebirds, crabs, and carnivorous snails.
Similar Species
Bleeding Tooth Nerite (Nerita peloronta) and Four-toothed Nerite (Nerita versicolor), which can be distinguished by their distinct coloration, larger size, or specific tooth arrangements on the columella.
Beach Finding Tips
Look along rocky intertidal zones, jetties, and limestone outcrops at low tide. Check crevices and high-tide lines where they cluster together.