Baytop's Onion vs common door snail

Allium baytopiorum compared with Clausilia bidentata

Key Differences

• Baytop's Onion is Critically Endangered while common door snail is Least Concern.

Taxonomic Classification

Rank	Baytop's Onion	common door snail
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Magnoliophyta (Flowering Plants)	Mollusca (Mollusks)
Class	Liliopsida (Monocots)	Gastropoda (Gastropoda)
Order	Asparagales (Asparagales)	Stylommatophora (Stylommatophora)
Family	Amaryllidaceae	Clausiliidae
Genus	Allium	Clausilia
Species	Allium baytopiorum	Clausilia bidentata

Conservation Status

Baytop's Onion

CR — Critically Endangered

common door snail

LC — Least Concern

Physical Characteristics

Attribute	Baytop's Onion	common door snail
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Baytop's Onion

Habitat

Typically found in grasslands, wetlands, forests, and cultivated landscapes.

common door snail

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

Baytop's Onion

The Baytop's Onion (Allium baytopiorum) is a species in the genus Allium. It is currently classified as Critically Endangered on the IUCN Red List. Typically found in grasslands, wetlands, forests, and cultivated landscapes.

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.