Checkered Nerite (also known as the Antillean Nerite)
Phylum: Mollusca, Class: Gastropoda, Order: Neritida, 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 to 0.75 inches, which is average for an adult specimen of this species. Typical adults range from 0.4 to 1 inch.
Color & Pattern
The shell exhibits a distinct checkered or tessellated pattern with alternating white or cream-colored spots and dark brown to black markings. The colors are somewhat weathered and sun-bleached due to its exposure in the intertidal zone.
Rarity
Very Common, frequently found by beachcombers exploring rocky shorelines and intertidal areas within its native range.
Habitat
Found primarily in the high intertidal zone, clinging tenaciously to rocky shores, limestone cliffs, and mangrove roots where it is exposed to heavy wave action and air during low tide. It is a marine species.
Geographic Range
Western Atlantic, ranging from southern Florida, the Bahamas, and the Caribbean down to northern South America.
Description
A small, sturdy, globular gastropod shell featuring a low spire and a thickened outer lip. The exterior surface is adorned with low spiral ridges and a characteristic black-and-white checkered mosaic pattern. The heavy, calcified structure is specially adapted to withstand crashing waves and harsh drying conditions.
Key Features
Compact, stout globular shape; flattened columellar deck with fine denticles (teeth) on the inner lip; distinct checkered color pattern with alternating dark and light squares.
Collector Value
Low to moderate commercial value. While widely collected by amateur beachcombers due to its abundance, it is rarely sought after by advanced shell collectors unless part of a comprehensive neritid family collection.
Condition Notes
Fair to Good condition. The shell is intact with some surface wear, weathering, and minor sun-bleaching characteristic of high-intertidal specimens exposed to wave action and elements. No major structural fractures visible.
Interesting Facts
Nerites are famous for their remarkable homing abilities, often returning to the exact same crevice or feeding spot after foraging for algae during high tide. They possess a specially modified operculum that locks tightly to seal in moisture when exposed to air.
Ecological Role
Acts as an important marine herbivore, grazing on microalgae and biofilm on rocks, which helps regulate algal growth and maintain intertidal ecosystem balance. Serves as a food source for various shorebirds and predatory fish.
Similar Species
Bleeding Tooth Nerite (Nerita peloronta) and Four-toothed Nerite (Nerita versicolor). Distinguished by the bright red 'teeth' on the columella of N. peloronta and the colourful striped pattern of N. versicolor.
Beach Finding Tips
Search rocky intertidal zones, jetties, limestone outcroppings, and seawalls at low tide. Look closely in crevices and depressions where these snails cluster to avoid desiccation.