Common Bithynia vs Laysan Duck

Bithynia tentaculata compared with Anas laysanensis

Key Differences

• Common Bithynia is Least Concern while Laysan Duck is Critically Endangered.

Taxonomic Classification

Rank	Common Bithynia	Laysan Duck
Kingdom same	Animalia (hewan)	Animalia (hewan)
Phylum	Mollusca (Moluska)	Chordata (Chordates)
Class	Gastropoda (siput)	Aves (burung)
Order	Littorinimorpha (Littorinimorpha)	Anseriformes (Anseriformes)
Family	Bithyniidae	Anatidae
Genus	Bithynia	Anas
Species	Bithynia tentaculata	Anas laysanensis

Evolutionary Relationship

Common Bithynia and Laysan Duck share a common ancestor at the Kingdom level: Animalia. (hewan)

Conservation Status

Common Bithynia

LC — Least Concern

Laysan Duck

CR — Critically Endangered

Physical Characteristics

Attribute	Common Bithynia	Laysan Duck
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Bithynia

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, Sweden, and United States.

Laysan Duck

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and Mediterranean forests and woodlands within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Distributed across Belgium, France, Netherlands, Norway, and United Kingdom. Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Common Bithynia

The common bithynia (<em>Bithynia tentaculata</em>) is a freshwater gastropod snail belonging to the family Bithyniidae. It is classified as Least Concern on the IUCN Red List and has been recorded across terrestrial and aquatic habitats in Belgium, Denmark, Norway, Sweden, and the United States. <em>Bithynia tentaculata</em> typically inhabits slow-moving or still freshwater environments such as lakes, ponds, canals, and rivers, often on muddy or sandy substrates where organic material is abundant. The species has a distinctive operculum that seals the shell opening, providing protection against desiccation and predators. It typically feeds by grazing on algae, detritus, and biofilms on submerged surfaces. The common bithynia serves as an intermediate host for several trematode parasites, making it ecologically significant in freshwater food webs and parasite life cycles. Biological traits of this species remain poorly documented in the scientific literature.

Laysan Duck

Laysan Duck (Anas laysanensis) is classified as Critically Endangered (CR) on the IUCN Red List. Facing an extremely high risk of extinction in the wild due to severe population decline and habitat loss.

Shared Countries

Both species can be found in 2 countries:

🇧🇪 Belgium 🇳🇴 Norway