Tessellated Nerite or Zebra 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 0.75 inches (18-25 mm) in width, which is average for this species. Adults typically range from 0.5 to 1 inch.
Color & Pattern
Featuring a distinctive tessellated or checkered pattern of dark brown to black rectangular markings contrasting against a whitish or greyish-white background. The spire is whitish and heavily eroded, showing a smooth chalky appearance.
Rarity
Very Common
Habitat
Found primarily in the high intertidal zone on rocky shores, limestone formations, mangrove roots, and seawalls, where they cling tightly to rocks to withstand wave action and exposure to air.
Geographic Range
Western Atlantic Ocean, including the Caribbean Sea, Gulf of Mexico, Florida Keys, Bermuda, and south along the coast of South America.
Description
A sturdy, compact marine snail shell with a low-spired, rounded body whorl and a flattened base. The exterior is adorned with a striking checkerboard pattern of dark patches. The outer surface shows fine spiral cords, and the heavy, thickened inner lip features small denticles.
Key Features
Low spire, flattened inner columellar lip with distinct small teeth (denticles), and the characteristic black-and-white checkered or tessellated color pattern.
Collector Value
Low to Moderate value. While very common and inexpensive, they are popular among beginning beachcombers and shell crafters due to their striking patterns and durability.
Condition Notes
Good condition. The shell is intact with vivid color patterns remaining on the body whorl, though the apex and spire show typical natural erosion revealing the white underlying shell layer.
Interesting Facts
Nerites are exceptionally hardy marine snails capable of surviving out of water for extended periods by sealing their operculum tightly. They are also known for grazing on microalgae, playing a vital role in keeping rock surfaces clean in the intertidal zone.
Ecological Role
As primary herbivores, nerites graze heavily on microalgae and diatom films on intertidal rocks, regulating algal growth and serving as a food source for coastal birds, crabs, and fish.
Similar Species
Bleeding Tooth Nerite (Nerita peloronta), which features distinctive red blood-like stains on the inner lip, and the Checkered Nerite (Nerita fulgurans), which is typically larger and found in slightly different muddy or brackish habitats.
Beach Finding Tips
Look along rocky intertidal zones, jetties, and limestone outcroppings at low tide. They are often found clustered together tightly in rock crevices or depressions out of the direct crashing surf.