Ceylon Spiny Mouse vs common freshwater nerite

Mus fernandoni compared with Theodoxus fluviatilis

Key Differences

• Ceylon Spiny Mouse is Endangered while common freshwater nerite is Least Concern.

Taxonomic Classification

Rank	Ceylon Spiny Mouse	common freshwater nerite
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Mollusca (Mollusks)
Class	Mammalia (Mammals)	Gastropoda (Gastropoda)
Order	Rodentia (Rodents)	Cycloneritida (Cycloneritida)
Family	Muridae (Mice & Rats)	Neritidae
Genus	Mus (House Mice)	Theodoxus
Species	Mus fernandoni	Theodoxus fluviatilis

Evolutionary Relationship

Ceylon Spiny Mouse and common freshwater nerite share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Ceylon Spiny Mouse

EN — Endangered

common freshwater nerite

LC — Least Concern

Physical Characteristics

Attribute	Ceylon Spiny Mouse	common freshwater nerite
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Ceylon Spiny Mouse

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

common freshwater nerite

Habitat

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

Range

Found across Europe (11 countries).

Ceylon Spiny Mouse

The Ceylon Spiny Mouse (Mus fernandoni) is a species in the genus Mus. It is currently classified as Endangered on the IUCN Red List.

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.