Pointed Mud Snail (Lymnaea stagnalis)

26 October 2026

160

Lymnaea stagnalis, commonly called the pointed mud snail or great pond snail, is a freshwater pulmonate snail found in quiet, vegetated waters. Its tall, pointed shell and ability to breathe atmospheric air make it distinctive in aquaria. It can be a useful scavenger, but it reproduces readily when food is abundant. The supplied images are broadly consistent with this species, although photographs alone cannot confirm identification with complete certainty.

Taxonomy and identification

Lymnaea stagnalis is a gastropod mollusc in the family Lymnaeidae. It is a pulmonate freshwater snail that regularly reaches the surface to breathe air. Identification is based on its relatively large, elongated, high-spired shell, broad opening, and pointed apex. Shell color and body color vary with age, water conditions, and individual genetics, so color alone is not diagnostic. The images show pointed, high-spired snails, but some photographs may depict similar pond snails; treat the identification as probable rather than definitive.

Natural habitat

This species inhabits freshwater ponds, marshes, lakes, ditches, and slow-moving margins with submerged or emergent vegetation. It commonly grazes on surfaces, rests among plants and debris, and visits the water surface for air. Stable, well-oxygenated water and access to calcium-rich surfaces support shell growth. It is adapted to temperate conditions and can tolerate seasonal changes more readily than many tropical aquarium snails.

Aquarium water requirements

Use mature, dechlorinated freshwater with low ammonia and nitrite and stable conditions. A practical aquarium range is about 10–24 °C and pH 7.0–8.5. Moderate hardness and available calcium help prevent thin, eroded shells; very soft, acidic water is unsuitable for long-term maintenance. Provide a secure lid because these snails can climb above the waterline. Avoid copper-based medications and other treatments intended to kill invertebrates.

Feeding

Lymnaea stagnalis grazes on algae, biofilm, microorganisms, decaying plant material, and other organic matter. In an aquarium it may also accept blanched vegetables and sinking foods such as algae wafers or omnivore pellets. Offer only small portions and remove leftovers. A sudden increase in numbers usually indicates excess food or accumulated organic matter rather than a need to feed the snails more.

Plant safety

It is not reliably plant-safe. Healthy, established plants are often left largely intact while the snail consumes algae, damaged leaves, and decaying tissue, but hungry individuals can rasp soft or weakened foliage. Avoid relying on this species for algae control in a valuable planted aquarium. Supply adequate food and plant cover, and monitor delicate or newly planted species for grazing damage.

Reproduction

This species is a simultaneous hermaphrodite: each adult has male and female reproductive organs and mating commonly involves two snails. It lays gelatinous egg masses on submerged plants, glass, hardscape, or other surfaces. Under favorable conditions, eggs hatch into small crawling snails and the population can grow quickly. Eggs and juveniles may arrive unnoticed on plants, equipment, or décor. Reproduction is strongly influenced by temperature, food availability, and water quality.

Population control

Control numbers by reducing excess feeding, removing uneaten food, cleaning accumulated waste, and manually removing adults and egg masses. A baited vegetable or snail trap can collect individuals for relocation or humane disposal, but traps require frequent checking. Quarantine and inspect new plants to prevent introductions. Do not release aquarium snails into natural waterways. Avoid copper or chemical molluscicides when other livestock, plants, or the biological filter could be harmed.

Snail info

Temperature : 10–24 °C
pH: 7.0–8.5

Related on Snails

Leave your comments

Latest on Snails

Red Widow Rennschnecke (Vittina waigiensis)

Vittina waigiensis is a nerite snail kept for its grazing activity and striking red shell forms. It is generally peaceful, plant-safe and suited to mature freshwater aquariums with stable, mineral-rich water. Like other amphidromous nerites, it may lay eggs in freshwater, but its larvae normally require brackish or marine conditions, so routine freshwater breeding is not expected. The trade name “Red Widow” may cover a selectively colored form rather than a formally recognized taxonomic variety.
Red racing snail (Vittina waigiensis)

The red racing snail, Vittina waigiensis, is a striking nerite kept mainly for grazing algae from aquarium glass, rocks and decor. Adults are generally peaceful, plant-safe and suited to mature freshwater aquariums, but successful captive breeding is uncommon because the larvae require different conditions from the adults. Shell colors and markings vary considerably, and trade names can overlap with other nerite species, so identification from appearance alone is not completely certain.
Mixed Aquarium Snails: Algae Eaters and Clean-Up Crew

This mixed snail selection appears to include nerite-type algae grazers, ramshorn snails, and possibly Malaysian trumpet snails. Exact species and proportions cannot be confirmed from the supplied images, so care requirements may differ between batches. These peaceful invertebrates consume algae, biofilm, leftover food, and detritus, but they still need stable, mineral-rich water and responsible population management.
Red and Yellow Stripe Rennschnecke (Vittina waigiensis)

Vittina waigiensis is a striking nerite snail recognized by a rounded shell with red, yellow, orange, and dark patterning. It is primarily a freshwater grazer as an adult but has a life cycle that normally requires brackish or marine conditions for larval development. This makes it suitable for planted aquariums without normally becoming numerous. The supplied trade name and images are consistent with this identification, although shell patterns overlap among Vittina and related nerite species, so visual identification should be treated as provisional.
Ramshorn Snails Mix Rainbow

Rainbow ramshorn snails are a mixed-color freshwater aquarium form sold under a trade name rather than a single precisely identified species. The pictured animals have the characteristic planispiral shell and include blue, pink, pale and orange-red forms. They are peaceful scavengers that graze on biofilm and leftover food. Exact species and strain lineage cannot be confirmed from the supplied images alone, so care guidance is provided for commonly kept aquarium ramshorn snails.
Predatory Snail: Clea helena (Anentome helena)

Clea helena, also widely sold under the name Anentome helena, is a freshwater predatory snail from Southeast Asia. Its banded, cone-shaped shell and active hunting behavior distinguish it from common algae-grazing snails. It feeds mainly on other snails but also accepts meaty foods and carrion. In a mature aquarium it is generally safe with healthy plants, although it can reduce or eliminate desirable snail populations. Identification and classification may vary between sources, so both commonly used scientific names are included.
Pond post horn snail (Planorbarius corneus)

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.
Pimpled Lace Snail (Melanoides granifera)

The pimpled lace snail, Melanoides granifera, is a burrowing freshwater snail from the family Thiaridae. It spends much of its time in substrate, emerging to graze on biofilm, detritus and leftover food. Its ridged, patterned shell adds interest to planted aquariums, while its live-bearing reproduction can gradually increase its numbers. It is generally peaceful and plant-safe when adequately fed, but should be kept under observation because identification and appearance can vary among imported aquarium stock.
Pink ramshorn snail (Planorbella duryi duryi)

The pink ramshorn snail is a freshwater planorbid recognized by its flat, coiled shell and pink to reddish body. The supplied name identifies it as Planorbella duryi duryi, a subspecies associated with the southeastern United States, although shell color alone cannot confirm an exact identification. It is peaceful, air-breathing, and useful as a scavenger in planted aquariums. Like many ramshorns, it can reproduce quickly when excess food and organic debris are available.
Piano Snail (Taia naticoides)

Taia naticoides is a freshwater, live-bearing snail sold under names such as piano snail. It has a rounded, banded shell and is valued as a grazer of algae and aquarium biofilm. The supplied photographs resemble this trade identification, but images alone cannot confirm species, age, or whether the specimen is a juvenile. Good calcium availability, stable alkaline water, and regular access to natural or supplemental food are important for long-term care.
Piano Snail (Taia naticoides)

The piano snail, also sold as the brush algae snail, is a large freshwater operculate snail with a rounded, banded shell. Taia naticoides is associated with Southeast Asian freshwater habitats and is valued for grazing surface growth and consuming organic debris. Aquarium identification can be complicated because common names are applied inconsistently; confirm the species with a reliable supplier. It is generally peaceful, plant-safe and live-bearing, but it needs mineral-rich water and should not be treated as a solution for heavy algae growth.
Orange Track Racing Snail (Vittina semiconica)

The Orange Track racing snail, Vittina semiconica, is a freshwater nerite valued for algae grazing and its patterned orange shell. It is generally peaceful, plant-safe and suitable for established community aquariums. Identification from shell pattern alone can be difficult because several Vittina and related nerite species resemble one another, so the supplied trade name should be treated as provisional unless confirmed by a specialist examination.
Orange Rock Snail (Orange Tylomelania)

The Orange Rock Snail is a trade name commonly used for orange-bodied Tylomelania, a group of freshwater snails associated with Sulawesi. Its dark, strongly ridged shell contrasts with the bright orange foot and head. Exact species identification is uncertain from the trade name and photographs alone, so care should follow general Tylomelania requirements. These snails are peaceful, active mainly at night, and best kept in mature, warm, alkaline aquariums with stable mineral content.
Orange Red Ramshorn Snail (Planorbella duryi duryi)

The orange red ramshorn snail is a freshwater planorbid recognized by its flat, coiled shell and brightly colored body. Planorbella duryi duryi is associated with freshwater habitats in the southeastern United States, especially Florida, although aquarium specimens may be selectively bred and their exact locality is often unknown. It is generally peaceful, useful as a grazer and scavenger, and capable of reproducing quickly when food is abundant.
Midnight Lady Snail (Vittina sp.)

The Midnight Lady Snail is a dark, patterned nerite sold under the aquarium trade name Midnight Lady Schnecke. It is identified here as Vittina sp., because the exact species cannot be confirmed from the supplied name and photograph alone. These snails are generally peaceful algae grazers for mature freshwater aquariums, but successful breeding requires conditions that are not normally present in freshwater tanks.
Ivory Predatory Snail: Anentome helena

The ivory predatory snail, commonly sold as Clea helena, is a freshwater assassin snail from Southeast Asia. It has a strongly ribbed, ivory to yellow-brown shell and a mottled gray-brown body. This active carnivore hunts or scavenges other small snails and accepts meaty foods in aquaria. It is generally plant-safe, but its predatory diet and egg-laying reproduction require planning when keeping it with ornamental snails or maintaining a controlled population.