Big Finner vs Lister's River Snail

Balaenoptera physalus compared with Viviparus contectus

Key Differences

• Big Finner is Endangered while Lister's River Snail is Least Concern.

Taxonomic Classification

Rank	Big Finner	Lister's River Snail
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Mollusca (Mollusks)
Class	Mammalia (Mammals)	Gastropoda (Gastropoda)
Order	Cetacea (Whales & Dolphins)	Architaenioglossa (Architaenioglossa)
Family	Balaenopteridae (Rorquals)	Viviparidae
Genus	Balaenoptera (Rorquals)	Viviparus
Species	Balaenoptera physalus	Viviparus contectus

Evolutionary Relationship

Big Finner and Lister's River Snail share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Big Finner

EN — Endangered

Lister's River Snail

LC — Least Concern

Physical Characteristics

Attribute	Big Finner	Lister's River Snail
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Big Finner

Habitat

Found across multiple habitat types including tropical and subtropical dry broadleaf forests, flooded grasslands and savannas, and montane grasslands and shrublands, among 4 distinct biome types within the Neotropic biogeographic realm.

Range

Widely distributed across Asia (Taiwan), Europe (5 countries), and South America (Colombia, Ecuador, Venezuela). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Lister's River Snail

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

Big Finner

Big Finner (Balaenoptera physalus) is classified as Endangered (EN) on the IUCN Red List. At high risk of extinction in the wild, with significant population decline and ongoing threats to survival.

Shared Countries

Both species can be found in 4 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden