Checkered Nerite, Zebra Nerite (alternate), Bleeding Tooth (related)
Phylum: Mollusca, Class: Gastropoda, Order: Cycloneritida, Family: Neritidae, Genus: Nerita, Species: Nerita tessellata · Neritidae (Nerite family) · Gastropod (univalve); Globose/Turbinate shape; Whole shell
Species
Nerita tessellata
Shell Type
Gastropod (univalve); Globose/Turbinate shape; Whole shell
Family
Neritidae (Nerite family)
Size
Approximately 15-20mm (0.6-0.8 inches). This is a mature size for this species, which usually tops out around 25mm.
Color & Pattern
Base color is off-white to creamy white. It features heavy black and purple-toned diagonal checkered bands or zig-zags. The patterns consist of rectangular spots that create a spiral tessellation. The apex is yellowish and slightly eroded.
Rarity
Very Common. These are among the most numerous gastropods found in rocky tropical intertidal environments.
Habitat
Marine intertidal zone; typically found clinging to rocks in the high splash zone or under ledges during low tide. They are highly adapted to withstand periods of exposure to air.
Geographic Range
Western Atlantic, ranging from Florida and Bermuda through the Caribbean Sea to Brazil. It is particularly common throughout the West Indies.
Description
A sturdy, globose shell characterized by its beautiful black-and-white checkered pattern. The surface is sculpted with numerous fine spiral ribs. The shell has a very low spire and a large, rounded body whorl. The aperture (not visible here) typically features a white, toothy labrum and a granular or smooth columellar area.
Key Features
Low spire, globose shape, spiral ribbing, and the distinct 'tessellated' or checkered pattern of dark spots on a light background. Lack of orange/bloody staining distinguishes it from Nerita peloronta.
Collector Value
Low monetary value ($1-$5) but high aesthetic value. It is a staple of beginner collections and often sold in bulk mixes for crafts or decor because of its sturdy nature and attractive patterns.
Condition Notes
Fine to Good. The pattern is vibrant and well-preserved. There is some minor natural erosion at the apex (common for intertidal species) and no visible major cracks or beach-wear. Collectibility is high for display due to the pattern clarity.
Interesting Facts
Nerites have a specialized 'stowaway' behavior where they huddle together to retain moisture. They are herbivorous grazers that use a radula to scrape algae off rocks. Some species in this family can survive in both fresh and saltwater.
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 shorebirds and crabs.
Similar Species
Nerita fulgurans (has more crowded, finer lines) and Nerita peloronta (the 'Bleeding Tooth', which has orange staining near the aperture teeth).
Beach Finding Tips
Do not look in the sand; look on the rocks. Search the 'splash zone' at low tide on rocky jetties or natural limestone outcrops. They often hide in crevices to avoid the midday sun.