Giant Ramshorn Snail (Marisa cornuarietis) – 1.5–4cm Size Grades

Giant Ramshorn Snail (Marisa cornuarietis) is a large freshwater apple-snail relative with a flat coiled shell that resembles a true ramshorn. Current taxonomy places it in the family Ampullariidae rather than the true ramshorn family Planorbidae. The current Shopify variants cover approximately 1.5–4 cm.

This is a peaceful but substantial grazing snail. It can eat algae films, soft plant material, prepared foods and decaying organic matter, but it should not be bought as a substitute for aquarium maintenance. It may also damage live plants, so it is a better fit for keepers who value the snail itself rather than a delicate aquascape.

What aquarium setup works best?

Use a mature filtered aquarium with stable mineral-rich freshwater. Smooth sand or rounded gravel is easy to clean, while wood, rock and glass provide grazing surfaces. A secure lid is sensible because active apple-snail relatives can explore above the waterline.

Shell condition depends strongly on water chemistry and diet. Very soft acidic water can contribute to erosion. Test pH and hardness, keep ammonia and nitrite at zero, and avoid large abrupt chemistry changes.

What should I feed a Giant Ramshorn?

Do not rely on incidental algae. Offer quality sinking snail or invertebrate foods, algae wafers and measured vegetables such as courgette or green bean. Remove soft leftovers before they spoil. Calcium and other minerals should come from a suitable overall water and feeding plan rather than uncontrolled dosing.

Will it eat aquarium plants?

It can. Marisa cornuarietis is a broad omnivorous grazer and is capable of eating healthy soft vegetation. Keep it in a planted aquarium only if some plant grazing is acceptable.

Which tank mates are suitable?

Peaceful fish, shrimp and non-predatory snails can work when water requirements overlap. Avoid puffers, many loaches, crayfish, crabs and other animals likely to attack exposed tissue or crack the shell. Competition for sinking food should also be considered.

Frequently asked questions

Is the Giant Ramshorn a true ramshorn snail?

No. Despite the flat coiled shell, Marisa cornuarietis is an apple-snail relative in Ampullariidae. Current GBIF and MolluscaBase taxonomy accepts the species under this name.

How large does it grow?

Around 5 cm shell diameter is a practical aquarium planning figure, although individuals can vary.

Will it clean my aquarium?

It will graze some algae and organic material, but it also needs feeding and produces waste. It cannot replace glass cleaning, filtration or water changes.

Can it live with shrimp?

Usually with peaceful adult shrimp when water requirements overlap, although both groups may compete for food.

Can it breed in freshwater?

Yes. This is a freshwater apple-snail relative and can reproduce in suitable aquariums. Do not allow ornamental livestock or eggs to escape into outdoor or natural waters.

What does one quantity buy?

One quantity buys one live snail in the selected size grade.

Taxonomy note: Marisa cornuarietis is currently accepted by GBIF and MolluscaBase; the common name “ramshorn” refers to shell shape rather than family placement.