common door snail vs tiny door snail

Clausilia bidentata compared with Clausilia rugosa

Taxonomic Classification

Rank	common door snail	tiny door snail
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Mollusca (มอลลัสกา)	Mollusca (มอลลัสกา)
Class same	Gastropoda (ชั้นแกสโทรโพดา)	Gastropoda (ชั้นแกสโทรโพดา)
Order same	Stylommatophora (Stylommatophora)	Stylommatophora (Stylommatophora)
Family same	Clausiliidae	Clausiliidae
Genus same	Clausilia	Clausilia
Species	Clausilia bidentata	Clausilia rugosa

Evolutionary Relationship

common door snail and tiny door snail share a common ancestor at the Genus level: Clausilia.

Conservation Status

common door snail

LC — Least Concern

tiny door snail

LC — Least Concern

Physical Characteristics

Attribute	common door snail	tiny door snail
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

common door snail

Habitat

Typically found in terrestrial and aquatic habitats including forests and freshwater.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

tiny door snail

Habitat

Typically found in terrestrial and aquatic habitats including forests and freshwater.

Range

Distributed across Belgium and Norway.

common door snail

<em>Clausilia bidentata</em>, the common door snail, is a terrestrial gastropod mollusk in the family Clausiliidae. This species is distributed across Belgium, Denmark, Norway, and Sweden, where it typically inhabits moist terrestrial environments including deciduous woodlands, rocky slopes, hedgerows, and the margins of freshwater habitats. The common door snail is recognized by its elongated, sinistral (left-handed) shell, which is a distinctive trait of the family Clausiliidae. The shell is typically brown to gray and reaches approximately 12–15 millimeters in length. <em>Clausilia bidentata</em> generally feeds on algae, lichens, fungi, and decaying plant material by rasping food with a radula. It often shelters under bark, stones, and leaf litter during dry or cold conditions. Like many clausiliids, it possesses a complex internal shell structure called a clausilium that closes the shell aperture to reduce desiccation. The species is assessed as Least Concern, reflecting stable populations across its European range. Detailed biological traits beyond those noted here are not extensively documented in the current scientific literature.

Shared Countries

Both species can be found in 2 countries:

🇧🇪 Belgium 🇳🇴 Norway