Tessellated Nerite (also known as the Checkered Nerite)
Phylum: Mollusca, Class: Gastropoda, Order: Cycloneritida, Family: Neritidae, Genus: Nerita, Species: Nerita tessellata · Neritidae (Nerite family) · Gastropod (univalve); globose/spiral shape. This specimen is a whole shell, though severely worn and missing the apex/spire region.
Species
Nerita tessellata
Shell Type
Gastropod (univalve); globose/spiral shape. This specimen is a whole shell, though severely worn and missing the apex/spire region.
Family
Neritidae (Nerite family)
Size
Approximately 15-20mm (0.6-0.8 inches). This is a standard adult size for the species, which typically maxes out at around 25mm.
Color & Pattern
Features a high-contrast pattern of black or dark grey rectangular spots (tessellations) arranged in spiral rows against a creamy white or pale grey background. The pattern resembles a checkerboard or Morse code. The colors appear naturally weathered with some encrustation.
Rarity
Very Common. These are among the most abundant small gastropods found on rocky coastlines throughout the Caribbean and Florida.
Habitat
Intertidal zone on rocky shores. They are high-tide inhabitants typically found clinging to rocks, in crevices, or on jetties where they can withstand heavy wave action and periods of exposure to air.
Geographic Range
Tropical Western Atlantic; ranging from Florida and the Gulf of Mexico through the Caribbean Sea to Brazil and Bermuda.
Description
A sturdy, thick-walled globose shell with a rounded body whorl. The surface is characterized by numerous fine spiral cords and the signature black-and-white checkered pattern. In living specimens, the aperture is protected by a calcareous operculum. This particular specimen shows significant erosion at the apex and has some calcium deposits or dried algae on the exterior.
Key Features
Distinguished by its 'tessellated' or checkered pattern, two small teeth on the inner edge of the columellar lip, and a lack of the orange/yellow staining often seen in other Nerite species.
Collector Value
Minimal (under $1 USD). Because they are so common and this specimen is heavily worn, it has educational value rather than monetary or high-end collector value.
Condition Notes
Poor to Fair. The shell is beach-worn with the spire (top) completely eroded away, exposing the interior whorls. There is significant mechanical wear and some encrustation on the body whorl. Not a gem-quality specimen, but a clear example of the species pattern.
Interesting Facts
Nerites have a remarkable ability to survive out of water for hours by sealing their shell with a tight-fitting operculum. They are 'grazers' that keep rocky shorelines clean by eating algae. Historically, some Nerite species were used as decorative beads.
Ecological Role
Primary consumer/herbivore. They play a vital role in controlling algal growth on tropical rocky shores and serve as a food source for various crabs and pufferfish.
Similar Species
Nerita fulgurans (Antillean Nerite) which has more pronounced ridges, and Nerita peloronta (Bleeding Tooth Nerite) which is larger and has a distinct red/orange stain near the teeth.
Beach Finding Tips
Look on the undersides of rocks or inside crevices at low tide along rocky shorelines. They are often found clustered together to retain moisture.