Checkered Nerite or Undulated Nerite
Phylum: Mollusca, Class: Gastropoda, Order: Neritida, Family: Neritidae, Genus: Nerita, Species: Nerita tessellata · Neritidae (Nerite family) · Gastropod (univalve), whole shell, globular/spiral shape
Species
Nerita tessellata
Shell Type
Gastropod (univalve), whole shell, globular/spiral shape
Family
Neritidae (Nerite family)
Size
Approximately 0.5 inches (12-15 mm) in length, which is average for this species. Adults typically range from 0.4 to 0.8 inches.
Color & Pattern
Cream to yellowish-white base color ornamented with characteristic dark brown or black chequered patterns, zig-zags, or spiral banding. Some greenish algal staining is visible on the surface. The interior aperture is smooth and white with a tooth-bearing outer lip.
Rarity
Very Common
Habitat
Intertidal zone, typically found on rocky shores, limestone formations, and clinging to rocks or pilings in the high-to-mid intertidal splash zone. Marine species adapted to exposure at low tide.
Geographic Range
Western Atlantic Ocean, including southern Florida, the Bahamas, the Caribbean Sea, and down to northern South America.
Description
A small, sturdy, globular gastropod shell featuring a low spire and a relatively large body whorl. The exterior surface displays distinctive spiral ribs and fine growth lines crossed by a checkered or mottled dark pattern. The aperture is heavily calcified with denticles on the inner lip margin, providing a tight fit for its operculum.
Key Features
Small globular shape, low spire, robust shell walls, distinctive checkered or patterned exterior markings, and a flattened columellar deck with teeth along the inner margin of the aperture.
Collector Value
Low monetary value, usually ranging from a few cents to a dollar, as they are extremely abundant throughout their range. They are popular beginner shells and commonly utilized in shell crafts.
Condition Notes
Intact whole shell in good condition. Shows natural weathering with mild surface algal growth and minor wear on the spire tip, but retains its structural integrity and distinct patterning. Collectibility grade: Good.
Interesting Facts
Nerites are remarkable for their ability to breathe air for extended periods, allowing them to survive out of water during low tide on hot rocks. They possess a strong radula used to scrape microalgae from rock surfaces.
Ecological Role
As primary herbivores and grazers, nerites play a vital role in controlling microalgal growth on rocky substrates, helping maintain balanced intertidal ecosystems. They serve as a food source for coastal birds and carnivorous fish.
Similar Species
Nerita peloronta (Bleeding Tooth Nerite) which is larger and features a distinct red-stained tooth resembling a bleeding tooth, and Nerita versicolor (Four-toothed Nerite) which has more prominent spiral ribs and varied colorful banding.
Beach Finding Tips
Search rocky intertidal zones, jetties, or limestone outcroppings at low tide. Look closely at crevices, tide pools, and the splash zone where these snails cluster tightly together.