Checkered Nerite, also known as the Black Nerite (bleached specimen)
Phylum: Mollusca, Class: Gastropoda, Order: Cycloneritida, Family: Neritidae, Genus: Nerita, Species: Nerita tessellata · Neritidae (Nerite family) · Gastropod (univalve); whole shell; globular/globose shape with a low spire.
Species
Nerita tessellata (Likely identification: 85% confidence)
Shell Type
Gastropod (univalve); whole shell; globular/globose shape with a low spire.
Family
Neritidae (Nerite family)
Size
Approximately 12-18mm in diameter. This is within the standard size range for adult Nerites, which typically reach up to 25mm.
Color & Pattern
Base color appears chalky white to light cream. While live specimens features black and white checkered patterns, this specimen appears sun-bleached or weathered, losing its dark pigments. Subtle spiral ridges are visible.
Rarity
Very Common. These are among the most abundant intertidal snails found on rocky shores.
Habitat
Intertidal zone, specifically the high-tide line. These are found clinging to rocks, in limestone crevices, or on mangroves in marine environments.
Geographic Range
Tropical Western Atlantic, including the Caribbean Sea, Gulf of Mexico, Florida, and south to Brazil.
Description
A sturdy, thick-walled globose shell with a very low spire and a large body whorl. The surface is characterized by numerous fine spiral cords. The aperture is semi-circular with a flat, tooth-like area called the 'columellar callus'.
Key Features
Globular shape, thickened outer lip, flattened columellar area (deck) with small teeth, and distinct spiral ribbing.
Collector Value
Low monetary value ($0.50 - $2.00). They are prized by beginners for their patterns when fresh, but bleached beach-worn specimens are usually considered 'study grade'.
Condition Notes
Fair condition. The specimen is historically intact but heavily weathered. The original 'tessellated' black pattern has faded due to UV exposure and wave action, resulting in a 'beach-worn' appearance. Collectibility grade: Good (for reference/educational purposes).
Interesting Facts
Nerites have a specialized 'operculum' (trapdoor) that seals moisture in, allowing them to survive for long periods out of water during low tide. They are strictly nocturnal grazers.
Ecological Role
Primary consumer/herbivore. They play a vital role in controlling algal growth on coastal rocks. They are a food source for shorebirds and crabs.
Similar Species
Nerita fulgurans (Antillean Nerite) which has more prominent, coarser ribs, and Nerita peloronta (Bleeding Tooth) which is larger and has a distinct red/orange stain on the columella.
Beach Finding Tips
Look in the 'splash zone' along rocky shorelines at low tide. They are often tucked into small holes or cracks in larger boulders to avoid predators and desiccation.
Notes
Cabo