Checkered Nerite, also known as the Common Nerite or Tessellated Nerite
Phylum: Mollusca, Class: Gastropoda, Order: Cycloneritida, Family: Neritidae, Genus: Nerita, Species: Nerita tessellata · Neritidae (Nerite family) · Gastropod (snail/univalve), whole shell, spiral shape
Species
Nerita tessellata
Shell Type
Gastropod (snail/univalve), whole shell, spiral shape
Family
Neritidae (Nerite family)
Size
Approximately 0.5 inches (12-15 mm) in length and width, which is average for this species. Adults typically range from 0.4 to 0.8 inches.
Color & Pattern
Distinctive checkerboard or tessellated pattern featuring alternating blocks or squares of dark reddish-brown, black, and chalky white. The colors are natural and vibrant with a smooth, glossy surface when fresh, though this specimen shows some surface wear.
Rarity
Very Common, frequently encountered by beachcombers in its native rocky intertidal habitats.
Habitat
Intertidal zone, specifically clinging to rocks, limestone cliffs, and mangrove roots in the splash zone and high intertidal areas where it is exposed to air during low tide. Marine species.
Geographic Range
Western Atlantic Ocean, including the Caribbean Sea, Gulf of Mexico, Florida Keys, and south along the coast of South America, consistent with the origin of Cuba.
Description
A small, sturdy, globose shell featuring a low spire and a broad body whorl. The outer surface is marked by low spiral ridges and a striking checkered pattern of dark and light patches. The aperture is semi-circular with a heavily toothed inner lip (columella) and a denticulate outer lip.
Key Features
The distinct black and white checkered or tessellated color pattern combined with the low-spired, rounded globose shape and the finely toothed columellar deck inside the aperture.
Collector Value
Low to moderate commercial value. While extremely popular among beginner shell collectors due to their striking patterns and accessibility, they are too common to command high prices, typically valued at a few cents to a dollar per specimen.
Condition Notes
Fair condition. The shell is intact with some natural weathering and minor calcium buildup or sun-bleached patches on the upper surface, but retains its characteristic color pattern. Collectibility grade: Good.
Interesting Facts
Nerites are famous for their remarkable ability to breathe air for extended periods, allowing them to survive out of water during low tide on scorching rocks. They use a powerful muscular foot and a hard operculum to clamp tightly to rocks to resist strong wave action.
Ecological Role
Nerites play an important grazing role in intertidal ecosystems by scraping microalgae and diatoms off rocks, helping to control algae growth and maintain substrate cleanliness. They serve as an important food source for shorebirds and predatory intertidal fish.
Similar Species
Bleeding Tooth Nerite (Nerita peloronta) and Four-toothed Nerite (Nerita versicolor), both of which can be distinguished by different color patterns and distinct teeth structures within the aperture.
Beach Finding Tips
Look along rocky shorelines, limestone outcrops, and jetties during extreme low tide. Search crevices, rock pools, and just above the waterline where they gather in groups.
Notes
Cuba