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Orange rabbit snail

Tylomelania gemmifera

Orange rabbit snail: aquarium gastropod in the family Pachychilidae, useful for biofilm, light algae, and substrate cleanup. Geographical Origin and Habitat: The Orange Rabbit Snail...

Taxonomy

Class:Gastropoda

Order:Sorbeoconcha

Family:Pachychilidae

Genus:Tylomelania

Species:Tylomelania gemmifera

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Water Temperature

20 - 28 °C

pH Value

7 - 8.4

Water type

Freshwater

Invertebrate type

Freshwater snail

Adult size

8 cm

Minimum group

>= 1

6 - 20 dGH

3 - 15 dKH

TDS

120 - 450 ppm

Ecological role

Scavenger

Copper sensitivity

High

Species description

Geographical Origin and Habitat: The Orange Rabbit Snail (*Tylomelania gemmifera*) is a stunning, highly specialized freshwater gastropod natively endemic exclusively to the ancient Malili Lakes system in Sulawesi, Indonesia. Their natural biotope is utterly unique: pristine, highly oxygenated, ultra-hard, and distinctly alkaline lake waters over soft mud or volcanic sand substrates. They spend their days dragging their massive shells across the warm lake bottom, endlessly foraging for fallen detritus and soft biological matter.

Taxonomy: Scientifically classified within the Pachychilidae family, they are massive and instantly recognizable. Fully mature adults can easily reach 8.0 to 11.0 centimeters (3.1-4.3 inches) in shell length. They feature a remarkably elongated, heavy, deeply grooved conical shell. They are universally known as "Rabbit Snails" due to their most distinctive morphological feature: a long, drooping, snout-like mouth and two long, drooping sensory tentacles that perfectly resemble a rabbit's face. They breathe via gills.

Social Behavior: They are exceptionally peaceful, slow-moving, and methodical giants. Due to their massive, heavy shell and relatively small foot, their movement is a distinct "drag and drop" motion—they pull themselves forward, causing the shell to lurch heavily behind them. They possess absolutely zero predatory instincts. They are highly active scavengers, constantly using their long, flexible proboscis (snout) to dig deep into soft substrate or reach into rock crevices to extract edible organic matter.

Coloration and Sexual Dimorphism: Sexual dimorphism is visually non-existent; they have distinct male and female sexes, but they cannot be differentiated without dissection. Their coloration is absolutely spectacular and the primary reason for their immense popularity. The deeply ridged, heavily textured conical shell is usually dark chocolate, muddy brown, or black, often with heavily eroded, white tips. In stark contrast, their fleshy body, snout, and drooping tentacles are a brilliant, neon, highly saturated orange or yellow-orange.

Care, breeding and tankmates

Tank Setup: The aquarium architecture MUST replicate the warm, alkaline lakes of Sulawesi. A minimum 75-liter (20-gallon) tank is required for a small group.

CRITICAL REQUIREMENT: The substrate MUST be soft sand or very fine, smooth gravel. Sharp gravel will severely lacerate their soft, fleshy foot, and deep rocks will trap their massive, dragging shells, causing them to starve to death. They do not climb glass well and do not require tight lids. The tank should feature smooth stones and open sandy areas.

Diet and Feeding: They are ravenous, heavy-duty detritivores and opportunistic omnivores.

CRITICAL WARNING: While they prefer detritus, hungry Rabbit Snails CAN and WILL consume soft, delicate aquarium plants (like Microsorum or tender stem plants). To protect plants, their massive appetite must be heavily fueled daily. They eagerly consume sinking omnivore wafers, blanched vegetables (zucchini, carrots, spinach), and spirulina powder. They also heavily benefit from decaying Indian Almond leaves.

Water Quality: Originating from the ancient Sulawesi lakes, they possess an uncompromising, strict biological requirement for WARM, highly alkaline, and HARD water. They require significant tropical heat (26-30°C / 79-86°F); keeping them in cool water will cause lethal lethargy. They strictly require hard water (GH 6-15, pH 7.5 - 8.5) rich in calcium. Soft, acidic water (below pH 7.0) is absolutely forbidden; it will rapidly and lethally dissolve their massive, heavy shells and crash their biological functions.

Compatibility and Tankmates: Compatibility is heavily restricted by their strict temperature and water chemistry requirements. They are perfect, peaceful giants for specialized Sulawesi setups. They are excellent companions for Sulawesi Shrimp (Cardinal Shrimp) or peaceful, heat-loving fish. They MUST NEVER be housed with aggressive, snail-eating predators (massive Loaches, large Cichlids, Pufferfish) that will effortlessly rip their bright orange, exposed bodies from their shells.

Aquarium Breeding: Breeding the Orange Rabbit Snail is slow but highly rewarding. They are livebearers (viviparous); females incubate the eggs internally. However, unlike other livebearers, they do not give birth to loose snails. The female expels a distinct, milky-white, gelatinous "egg sac" onto the substrate. Within minutes, the sac dissolves, releasing a single, perfectly formed, miniature Rabbit Snail (usually 0.5 cm long). They reproduce very slowly (one baby every few weeks) and will never overpopulate.

Risks and Diseases: The absolute greatest physical risk is slow, agonizing death from massive shell degradation and osmotic shock caused by placing them in standard, soft-water community tanks; high pH, hard water, and tropical heat are unconditionally mandatory. The second major risk is lethal starvation caused by getting their heavy shells permanently trapped in deep, coarse gravel or dense rockwork. Finally, they will decimate delicate plants if their massive appetite is not fully satiated with vegetables.

Geographic Origin and Distribution

The Orange Rabbit Snail (*Tylomelania gemmifera*) is a stunning, highly specialized freshwater gastropod natively endemic exclusively to the ancient Malili Lakes system in Sulawesi, Indonesia. Their natural biotope is utterly unique: pristine, highly oxygenated, ultra-hard, and distinctly alkaline lake waters over soft mud or volcanic sand substrates. They spend their days dragging their massive shells across the warm lake bottom, endlessly foraging for fallen detritus and soft biological matter.

Origin

North AmericaEurope, Mediterranean, and West AsiaSouth and Southeast AsiaEast Asia

Invertebrate profile

Diet: Biofilm grazer
Ecological role: Scavenger
Shock sensitivity: High
Calcium and minerals: High
Molting: Shell growth
Reproduction: Variable
Compatibility & tankmates: Peaceful

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

Related species

Recommendations grouped by close relatives, companion choices, and similar care.

Variants and close relatives

Same atlas type, nearby scientific identity, genus, or family.

Patriarch rabbit snail

Tylomelania patriarchalis

Species description

Care, breeding and tankmates