Checkered Nerite (also known as the Tessellated Nerite)
Phylum: Mollusca, Class: Gastropoda, Order: Cycloneritida, Family: Neritidae, Genus: Nerita, Species: Nerita tessellata · Neritidae (Nerite family) · Gastropod (univalve) whole shell, globose or rounded shape with a low spire
Species
Nerita tessellata
Shell Type
Gastropod (univalve) whole shell, globose or rounded shape with a low spire
Family
Neritidae (Nerite family)
Size
Approximately 0.5 to 0.75 inches, which is average for this species. Adults typically range from 0.4 to 1.0 inch.
Color & Pattern
Distinctive black and white or cream checkered or tessellated pattern forming a fine grid across the exterior surface. The apex shows a whitish or cream-colored eroded or natural tip.
Rarity
Very Common, frequently encountered by beachcombers and tidepool explorers in its natural range.
Habitat
Found primarily in the high intertidal and supratidal zones, clinging to rocky shores, limestone cliffs, and mangrove roots where they endure exposure to air and sun.
Geographic Range
Western Atlantic Ocean, including the Caribbean Sea, Gulf of Mexico, Florida Keys, Bermuda, and down to the northern coast of South America.
Description
A robust, compact marine snail shell featuring a rounded body whorl and a very low, blunt spire. The outer surface is decorated with a striking geometric checkerboard pattern of dark brown-black markings on a pale whitish-grey background. The texture features faint spiral striations.
Key Features
Globular shape, low spire, flat inner columellar lip with tiny denticles, and the signature high-contrast black-and-white checkered pattern.
Collector Value
Low monetary value due to high abundance, but widely collected as a staple species for beginning shell enthusiasts and educational displays. Typically worth less than a dollar per specimen.
Condition Notes
Good condition with natural coloration largely intact, slight wear on the apex/tip, typical of intertidal tumbled specimens. Collectibility grade is Good.
Interesting Facts
Nerites possess amazing physiological adaptations allowing them to breathe air and survive out of water for extended periods during low tides. They graze on microscopic algae using a specialized ribbon-like tongue called a radula.
Ecological Role
Acts as an important marine herbivore, grazing on microalgae to keep rock surfaces clean and serving as a key food source for coastal shorebirds and small predators.
Similar Species
Nerita peloronta (Bleeding Tooth) which is larger and features red staining around the aperture, and Nerita versicolor (Four-toothed Nerite) which has colorful banding.
Beach Finding Tips
Search rocky outcroppings, jetties, and limestone formations during low tide, particularly just above the waterline where they cluster together.