Zebra Nerite, also known as Common Nerite or Blood-spotted Nerite
Phylum: Mollusca, Class: Gastropoda, Order: Cycloneritida, Family: Neritidae, Genus: Nerita, Species: Nerita fulgurator · Neritidae (Nerite family) · Gastropod univalve whole shell with a robust, hemispherical or oval shape and low spire
Species
Nerita fulgurator
Shell Type
Gastropod univalve whole shell with a robust, hemispherical or oval shape and low spire
Family
Neritidae (Nerite family)
Size
Approximately 0.75 to 1 inch in length, which is average for this species. Adults typically range between 0.5 and 1.2 inches.
Color & Pattern
Rich dark brown to black base color adorned with fine, zigzag patterns, whitish or yellowish streaks, and flashes resembling lightning bolts. The colors appear natural and glossy, displaying a smooth exterior finish with characteristic fine spiral striations.
Rarity
Common, frequently found in its specific intertidal rocky habitats across its geographic range.
Habitat
Found in marine and brackish intertidal zones, typically clinging to hard substrates such as rocky shores, limestone outcrops, mangrove roots, and wharf pilings in the splash zone.
Geographic Range
Tropical and subtropical Western Atlantic, including the Caribbean Sea, the Gulf of Mexico, Florida, the Bahamas, and down to northern South America.
Description
A sturdy, compact gastropod featuring a low, rounded spire and a thick, heavy shell designed to withstand powerful wave action. The surface is subtly textured with fine, delicate spiral ridges. The outer lip is slightly thickened, and the inner columellar lip features a flattened, denticulate (toothed) area typical of nerites.
Key Features
Hemispherical low-spired shape, thick and heavy construction for its size, distinctive zigzag or flame-like light markings over a dark brown background, and a flattened, tooth-lined columellar margin.
Collector Value
Modest collector value. While common and inexpensive, they are popular among shell crafters and general beachcomber collections due to their striking, durable patterns and glossy finish.
Condition Notes
Good overall condition. The shell is intact with good retention of its natural glossy pattern, minor wear near the apex typical of intertidal exposure, and solid structural integrity. Collectibility grade is Fine.
Interesting Facts
Nerites are remarkable for their ability to breathe air for extended periods during low tide, firmly sealing themselves against rocks to retain moisture. They possess a strong radula used to scrape microalgae off rocks.
Ecological Role
Important grazers in the intertidal ecosystem, helping to control microalgal growth on rocky surfaces. They serve as a food source for various shorebirds, crabs, and carnivorous fish.
Similar Species
Bleeding Tooth Nerite (Nerita peloronta) and Four-toothed Nerite (Nerita versicolor). Distinguished by the specific coloration, absence of the bright red 'bleeding tooth' mark, and differing fine pattern details.
Beach Finding Tips
Search rocky intertidal zones, jetties, and limestone formations at low tide. Look closely at crevices and the undersides of rocks where they congregate to avoid desiccation.