Bare-bellied Hedgehog vs common river snail

Paraechinus nudiventris compared with Viviparus viviparus

Taxonomic Classification

Rank	Bare-bellied Hedgehog	common river snail
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Mollusca (Mollusks)
Class	Mammalia (Mammals)	Gastropoda (Gastropoda)
Order	Erinaceomorpha (Erinaceomorpha)	Architaenioglossa (Architaenioglossa)
Family	Erinaceidae	Viviparidae
Genus	Paraechinus	Viviparus
Species	Paraechinus nudiventris	Viviparus viviparus

Evolutionary Relationship

Bare-bellied Hedgehog and common river snail share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Bare-bellied Hedgehog

LC — Least Concern

common river snail

LC — Least Concern

Physical Characteristics

Attribute	Bare-bellied Hedgehog	common river snail
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Bare-bellied Hedgehog

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

common river snail

Habitat

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

Range

Found across Europe (7 countries).

Bare-bellied Hedgehog

The Bare-bellied Hedgehog (Paraechinus nudiventris) is a species in the genus Paraechinus. It is currently classified as Least Concern on the IUCN Red List. Typically found in diverse terrestrial and aquatic ecosystems.

common river snail

<em>Viviparus viviparus</em>, the common river snail, is a freshwater gastropod mollusk in the family Viviparidae, order Architaenioglossa. It is distributed across Europe, with populations documented in Austria, Belgium, Bulgaria, Czech Republic, France, Germany, and Hungary, among other countries, typically inhabiting slow-moving and still freshwater bodies including rivers, canals, ponds, and ditches. The species is assessed as Least Concern on the IUCN Red List. Common river snails typically live in soft-sediment benthic habitats, grazing on algae, aquatic plant material, and organic detritus using a radula — a ribbon-like feeding organ characteristic of gastropods. <em>Viviparus viviparus</em> is notable among freshwater mollusks for being viviparous, giving birth to fully formed juvenile snails rather than laying eggs, an adaptation reflected in both the genus and family names. This reproductive strategy typically results in small litter sizes but high juvenile survival compared to egg-laying mollusks. The species plays a role in benthic nutrient cycling and serves as prey for waterfowl, fish, and crayfish. Biological traits such as precise lifespan, body measurements, and population density data vary across localities and remain incompletely documented in comprehensive studies.