Zebra Nerite Snail, Zebra Nerite, Onion Snail
Phylum: Mollusca, Class: Gastropoda, Order: Neritida, Family: Neritidae, Genus: Neritina, Species: Neritina natalensis · Neritidae (Nerite family) · Gastropod (snail/univalve), whole shell, spiral shape
Species
Neritina natalensis
Shell Type
Gastropod (snail/univalve), whole shell, spiral shape
Family
Neritidae (Nerite family)
Size
Approximately 0.75 inches (20 mm) in length and width. This is average for the species, which typically ranges from 0.5 to 1 inch.
Color & Pattern
Rich dark brown to black background featuring striking, highly contrasting zigzag or wavy golden-yellow bands that resemble zebra stripes. The colors are entirely natural with a glossy, polished exterior finish. The interior and aperture are not clearly visible in this orientation, but typically feature a yellowish or whitish base with a smooth columellar shelf.
Rarity
Common (frequently found within its native habitat and widely available through the aquarium trade, though a beach find outside of its native range would be unlikely).
Habitat
Found in shallow, slow-moving freshwater streams, rivers, and sometimes brackish estuaries. They typically inhabit muddy or sandy bottoms, rocks, submerged wood, and dense aquatic vegetation.
Geographic Range
Native to East Africa, specifically found in countries such as Kenya, Mozambique, Somalia, South Africa, and Tanzania. Widely distributed in the pet trade globally.
Description
A compact, robust, globose-conic snail shell featuring a low spire and a large, rounded body whorl. The surface is smooth with fine growth lines, showcasing a mesmerizing pattern of golden tiger or zebra stripes over a dark chocolate-brown base. The outer lip is sharp, and the base exhibits a flattened, calcified columellar deck characteristic of nerites.
Key Features
Globose-conic shape, low spire, smooth glossy texture, and distinctive golden-yellow zigzag or wavy bands running across a dark brown background. Flattened inner lip (columellar deck).
Collector Value
Moderately valued among freshwater aquarium hobbyists and shell enthusiasts. Typically sold in pet and aquarium shops rather than specialized shell markets, usually valued between $2 to $5 per specimen.
Condition Notes
Good condition with rich original color, glossy finish, and minimal wear on the apex. Collectibility grade is Fine.
Interesting Facts
Zebra Nerites are extremely popular in freshwater aquariums because they are voracious algae eaters and, uniquely, cannot reproduce in freshwater—their larvae require brackish water to survive, meaning they will not overpopulate an aquarium.
Ecological Role
Acts as an important grazer in freshwater and brackish ecosystems, controlling microalgae growth on rocks and vegetation. They serve as a food source for various fish, birds, and crustaceans.
Similar Species
Neritina turrita (Snail with higher, more elongated spire) and Vitta virginea (Olive nerite, which displays much greater color and pattern variability).
Beach Finding Tips
As a freshwater and brackish species, these are not typically found during traditional ocean beachcombing. To find them, search along the muddy banks or submerged rocks of slow-moving East African rivers and estuaries.