Pond post horn snail (Planorbarius corneus)

25 October 2026

139

Planorbarius corneus is a European freshwater ramshorn snail found in ponds, lakes, marshes and slow-moving waters. Its large, planispiral shell and dark body make it a distinctive aquarium inhabitant, although the common name can be confused with other ramshorn snails. It is generally peaceful, useful as a scavenger and algae grazer, and manageable when food supplies are controlled.

Pond post horn snail (Planorbarius corneus)

Taxonomy and identification

Planorbarius corneus is a freshwater pulmonate gastropod in the family Planorbidae. The shell is rounded and coiled in one plane, with visible growth lines. The animal commonly has a dark grey, brown or nearly black body. Aquarium specimens may be confused with other planorbids, so identification from photographs alone is not always certain; the supplied name is treated here as Planorbarius corneus.

Natural habitat

This species occurs in still or slowly flowing freshwater, including ponds, lakes, ditches, marshes and vegetated margins. It favors oxygenated areas with submerged plants, algae, leaf litter and surfaces suitable for grazing. It can tolerate seasonal changes and may breathe atmospheric air using its pulmonary cavity.

Aquarium water parameters

Provide stable, clean freshwater with moderate hardness and a reliable supply of calcium and carbonate for shell growth. A practical aquarium range is 10–24 °C and pH 7.0–8.4. Avoid prolonged acidic, very soft water, sudden temperature changes, ammonia and nitrite. Filtration and regular partial water changes are important, especially in heavily fed or densely stocked aquariums.

Feeding

Planorbarius corneus grazes algae, biofilm and microorganisms from glass, wood, stones and plant surfaces. It also consumes softening plant debris and uneaten food. Offer small amounts of sinking algae wafers, vegetable foods such as blanched courgette or spinach, and an occasional calcium-rich food. Remove uneaten portions promptly because excess food drives population growth and degrades water quality.

Plant safety

A well-fed specimen usually leaves healthy, established plants alone and concentrates on algae, biofilm and decaying material. It may rasp weakened, damaged or naturally soft leaves, particularly when food is scarce. Delicate new growth can be affected in crowded tanks. Healthy plants with adequate supplemental feeding are generally safe, but no snail should be described as completely plant-proof.

Reproduction

This species is a simultaneous hermaphrodite, with individuals producing both eggs and sperm. Mating can occur between two snails, and gelatinous egg masses are attached to plants, glass, décor or other firm surfaces. Young hatch as miniature snails. Warm conditions, abundant food and a mature population can result in rapid increases, although reproduction is usually slower in cooler, food-limited conditions.

Population control

Control numbers primarily by reducing excess food, feeding measured portions and removing uneaten food. Regularly inspect glass, plants and décor for egg masses and remove unwanted clutches manually. A baited vegetable or snail trap can help collect adults without medication. Physically remove surplus snails and rehome them where legal and appropriate. Avoid copper-based treatments in aquariums containing desired snails, and never release specimens into natural waterways.

Compatibility and care

These snails are peaceful and can be kept with non-aggressive community fish and other compatible freshwater invertebrates. Avoid fish and invertebrates that bite, prey on or harass snails. Use a covered aquarium because individuals may climb above the waterline. Provide smooth surfaces, plant cover and enough mineral availability to prevent shell erosion.

Snail info

Temperature : 10–24 °C
pH: 7.0–8.4

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