common river snail vs Hector s Dolphin

Viviparus viviparus compared with Cephalorhynchus hectori

Key Differences

• common river snail is Least Concern while Hector s Dolphin is Endangered.

Taxonomic Classification

Rank	common river snail	Hector s Dolphin
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Chordata (Chordates)
Class	Gastropoda (Gastropoda)	Mammalia (Mammals)
Order	Architaenioglossa (Architaenioglossa)	Cetacea (Whales & Dolphins)
Family	Viviparidae	Delphinidae (Oceanic Dolphins)
Genus	Viviparus	Cephalorhynchus
Species	Viviparus viviparus	Cephalorhynchus hectori

Evolutionary Relationship

common river snail and Hector s Dolphin share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

common river snail

LC — Least Concern

Hector s Dolphin

EN — Endangered

Physical Characteristics

Attribute	common river snail	Hector s Dolphin
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

common river snail

Habitat

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

Range

Found across Europe (7 countries).

Hector s Dolphin

Habitat

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.