科: Neritidae
ヘルメットネライトはネリト科の淡水貝で、黒いヘルメットのような殻が特徴。殻径約 3–4 cm、適水温 22–26 °C。淡水では繁殖しない。
Neritina pulligera is a Neritidae freshwater snail, the Black Helmet Nerite — a larger, darker algae cleaner with a smooth helmet shell. In the aquarium it stays a tireless, peaceful grazer. Plan on a 3–4 cm shell at 22–26 °C in medium-hard alkaline water; like all nerites it cannot reproduce in freshwater.
難易度：簡単。Peaceful — completely plant-safe。
22–26 °C を安定して維持。pH 7–8.5、GH 8–20 dGH。
成魚 3–4 cm 前後。Bottom — scraping glass and hardscapeのため 30 L 以上の水槽を推奨。
Grazing algae eater; handles diatoms and green algae。人工飼料に冷凍餌を組み合わせて。
Peaceful — completely plant-safe。混泳の相手：Any peaceful fish and shrimp — A universal cleanup companion, Zebra nerites — Different look, same job。Loaches and pufferfish — Specialist snail predators, Copper-based medications — Lethal to all invertebratesは避ける。
原産地はIndo-Pacific — from India to the Philippines。Rivers and estuaries on firm surfacesに生息。Still to gentle current。Moderate oxygen。
繁殖：Requires brackish water to reproduce — will not overrun freshwater tanks。No practical external difference。