Winged nerite snail

Geographical Origin & Biotope:

The Winged Nerite Snail (Neritodryas cornea) is a highly unique, semi-terrestrial aquatic gastropod natively endemic to the mangrove swamps, tidal mudflats, and tropical coastal forests of Southeast Asia and the Pacific Islands. Unlike strictly aquatic snails, their natural biotope bridges the gap between water and land. They are frequently found clinging to the aerial roots of mangroves, damp coastal rocks, and wet vegetation situated distinctly *above* the waterline, thriving in the highly humid, brackish environment of the tidal splash zone.

Taxonomy & Morphology:

Scientifically classified within the Neritidae family, they are a medium-sized, heavily armored snail. Fully mature adults reach 2.0 to 2.5 centimeters (0.8-1.0 inches) in diameter. They possess a dense, exceptionally thick calcium-carbonate shell engineered to withstand both predatory attacks and prolonged exposure to air. Their defining morphological feature—the "wings"—refers to the flared, slightly flattened edges of their shell aperture, which allows them to clamp down incredibly tight against flat surfaces to prevent dehydration during low tide.

Social Behavior:

They are entirely peaceful, highly independent scavengers. Their behavior is profoundly influenced by their semi-terrestrial nature. While they will patrol the underwater glass and rocks to scrape up diatoms and green spot algae, they possess an absolute, undeniable instinct to climb up and out of the water. They will often spend days attached to the aquarium glass just above the waterline, resting in the humid air before slowly descending back into the water to feed.

Coloration & Sexual Dimorphism:

Sexual dimorphism is visually non-existent; they cannot be sexed by the human eye. While lacking the bright, explosive colors of the Red Racer or Zebra Nerite, they possess a rugged, deeply textured beauty. The thick, slightly ridged shell usually features a deeply saturated mahogany, dark olive, or rich black-brown base, sometimes finely stippled with microscopic lighter speckles. Their dark coloration provides excellent camouflage against the dark wood of mangrove roots.

Tank Setup:

The aquarium architecture MUST accommodate their biological drive to leave the water. A minimum 20-liter (5-gallon) tank is sufficient. The tank should feature hardscapes (driftwood, tall rocks) that breach the surface. CRITICAL WARNING: Because they are naturally semi-terrestrial, they WILL climb out of the tank. An absolutely perfectly sealed, tight-fitting glass or heavy plastic lid is unconditionally mandatory. If the lid has gaps, they will escape, crawl across the room, and dehydrate to death on the floor.

Diet & Feeding:

They are specialized herbivorous aufwuchs grazers. They are excellent at consuming stubborn Green Spot Algae (GSA), diatoms, and thick biofilm from hard surfaces. They will not eat healthy aquarium plants. However, in pristine aquariums, they are highly prone to starvation. Their diet MUST be supplemented if visible algae runs out. Regular offerings of premium sinking algae wafers, and specifically, blanched vegetables (zucchini, spinach) placed on submerged driftwood, are unconditionally mandatory for their survival.

Water Quality:

Originating from coastal, often brackish environments, they possess a massive, uncompromising biological requirement for pristine, HARD water. They STRICTLY require hard, alkaline water (GH 8-20, pH 7.2 - 8.5) and warm tropical heat (24-28°C / 75-82°F). Keeping them in soft, acidic water (below pH 7.0) is absolutely fatal; the acidity will dissolve, pit, and erode their thick calcium-carbonate shells, leading to agonizing death. Flawless filtration is mandatory; they have zero tolerance for Ammonia or Nitrites.

Compatibility & Tankmates:

Compatibility is absolutely stellar due to their peaceful nature and heavily armored, tightly clamping shell. They are the perfect cleanup crew for peaceful freshwater or brackish community tanks, and especially for Paludariums. They completely ignore fish and shrimp. They MUST NEVER be housed with specialized snail-eating predators (like Pea Puffers, massive Loaches, or large Cichlids) that will crush their shells. Excellent companions include Bettas, Tetras, Guppies, and peaceful bottom-dwellers.

Aquarium Breeding:

Like other Nerites, this is a massive benefit: Winged Nerites CANNOT reproduce in a freshwater aquarium. Females will continuously lay tiny, hard, white eggs scattered across driftwood and rocks. While these eggs can be visually distracting and are very difficult to remove, they will NEVER hatch in freshwater. In the wild, their microscopic larvae MUST be washed out to the saltwater ocean to survive and develop. Thus, they will never overrun a tank like pest snails.

Risks & Diseases:

The absolute greatest physical risk is escaping and dehydration; their semi-terrestrial nature means they will actively try to leave the water, so a perfectly sealed lid is unconditionally mandatory. The second major risk is agonizing death from shell degradation caused by keeping them in soft, acidic water; hard, alkaline water is required. Finally, lethal starvation in clean, newly set up tanks lacking algae is a major threat; supplemental vegetable feeding is crucial.