common freshwater nerite vs Danube freshwater nerite

Theodoxus fluviatilis compared with Theodoxus danubialis

Taxonomic Classification

Rank	common freshwater nerite	Danube freshwater nerite
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Mollusca (Mollusks)	Mollusca (Mollusks)
Class same	Gastropoda (Gastropoda)	Gastropoda (Gastropoda)
Order same	Cycloneritida (Cycloneritida)	Cycloneritida (Cycloneritida)
Family same	Neritidae	Neritidae
Genus same	Theodoxus	Theodoxus
Species	Theodoxus fluviatilis	Theodoxus danubialis

Evolutionary Relationship

common freshwater nerite and Danube freshwater nerite share a common ancestor at the Genus level: Theodoxus.

Conservation Status

common freshwater nerite

LC — Least Concern

Danube freshwater nerite

LC — Least Concern

Physical Characteristics

Attribute	common freshwater nerite	Danube freshwater nerite
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

common freshwater nerite

Habitat

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

Range

Found across Europe (11 countries).

Danube freshwater nerite

Habitat

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

Range

Distributed across Germany and Norway.

common freshwater nerite

<em>Theodoxus fluviatilis</em>, commonly known as the common freshwater nerite, is a small aquatic gastropod mollusc belonging to the family Neritidae. This species is widely distributed across Europe, with documented occurrences in Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Hungary, Latvia, Norway, and Sweden. It typically inhabits freshwater environments, including rivers, streams, and lakes, where it grazes on algae and biofilm on hard substrates such as rocks and submerged wood. The common freshwater nerite is assessed as Least Concern on conservation metrics, reflecting its broad distribution and relatively stable populations across much of its European range. Biological traits of this species remain poorly documented in the scientific literature. <em>Theodoxus fluviatilis</em> plays an ecological role as a grazer in freshwater benthic communities, contributing to the regulation of algal growth on hard surfaces. The species typically favors clean, well-oxygenated waters and can serve as an indicator of water quality in freshwater systems. Its distinctive small, dome-shaped shell with variable patterning makes it recognizable among freshwater invertebrates.

Shared Countries

Both species can be found in 1 countries:

🇳🇴 Norway