Net Nerite or Checkered Nerite
Phylum: Mollusca, Class: Gastropoda, Order: Neritida, Family: Neritidae, Genus: Nerita, Species: Nerita tessellata · Neritidae (Nerite family) · Gastropod univalve, whole shell, globose or hemispherical shape with a low spire.
Species
Nerita tessellata
Shell Type
Gastropod univalve, whole shell, globose or hemispherical shape with a low spire.
Family
Neritidae (Nerite family)
Size
Approximately 0.75 inches (18-25 mm) in width, which is average for an adult specimen of this species. Adults typically range from 0.5 to 1 inch.
Color & Pattern
Features a striking checkered or net-like pattern with contrasting dark brown to black squares or reticulations over a whitish, greyish, or yellowish base. The interior aperture is white to pale yellowish with a toothed outer and inner lip.
Rarity
Common to Very Common within its natural range, frequently encountered by beachgoers and snorkelers exploring rocky intertidal zones.
Habitat
Found primarily in the intertidal zone, clinging tenaciously to rocky shores, limestone cliffs, jetties, and intertidal mangrove roots where they remain exposed to air and wave action during low tide.
Geographic Range
Western Atlantic Ocean, including the Caribbean Sea, the Gulf of Mexico, southern Florida, Bermuda, and down to northern South America.
Description
A sturdy, compact marine snail shell featuring a rounded, globular body whorl and a very low, flattened spire. The exterior surface is marked by prominent spiral cords crossed by fine growth lines, creating a textured checkerboard appearance defined by dark brown or black markings over a light background. The aperture is semicircular with a flattened columellar deck bearing fine denticles.
Key Features
Distinctive net-like or checkered dark banding on a light background, low flattened spire, thick sturdy shell wall, and a flattened inner columellar lip with small teeth along the edge.
Collector Value
Low to moderate commercial value. While not a high-priced rarity, it is a popular staple for beginning shell collectors and educational displays due to its attractive geometric patterning.
Condition Notes
The specimen appears to be in Good to Fine condition, largely intact with natural coloration preserved, though showing some minor wear typical of intertidal tumble and wave action.
Interesting Facts
Nerites are exceptionally well-adapted to life out of water and can survive extended periods of air exposure during low tide by sealing their aperture against the rock substrate using their operculum.
Ecological Role
Acts as an important marine herbivore, grazing on microalgae and diatom films on intertidal rocks, thereby helping to control algal growth and serving as a food source for coastal predators.
Similar Species
Nerita peloronta (Bleeding Tooth) and Nerita fulgurans (Antillean Nerite). They can be distinguished by specific colorations such as the blood-red teeth of the Bleeding Tooth or the more elongated shape of the Antillean Nerite.
Beach Finding Tips
Look along rocky shorelines, breakwaters, and limestone outcroppings during extreme low tide. Check crevices and shaded areas of rocks where they gather in groups.