Dwarf round ray vs European otter

Urotrygon nana compared with Lutra lutra

Key Differences

• Dwarf round ray is Near Threatened while European otter is Vulnerable.

Taxonomic Classification

Rank	Dwarf round ray	European otter
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Elasmobranchii	Mammalia (Mammals)
Order	Myliobatiformes (Myliobatiformes)	Carnivora (Carnivorans)
Family	Urotrygonidae	Mustelidae (Weasels & Otters)
Genus	Urotrygon	Lutra (Otters)
Species	Urotrygon nana	Lutra lutra

Evolutionary Relationship

Dwarf round ray and European otter share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Dwarf round ray

NT — Near Threatened

European otter

VU — Vulnerable

Trend: Stable →

Physical Characteristics

Attribute	Dwarf round ray	European otter
Diet	—	Carnivore
Average Lifespan	—	10 years
Average Length	—	1.0 m
Average Weight	—	10.0 kg

Habitat & Geographic Range

Dwarf round ray

European otter

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Found across Europe (6 countries). Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

European otter

Sleek semi-aquatic mustelid found along clean rivers, streams, and coastlines across Europe and Asia. European otters can reach 1.3 meters in length and are highly skilled fish hunters, using sensitive whiskers to detect prey movements. Requiring unpolluted water with abundant fish, they are an indicator species for freshwater ecosystem health. Once nearly extinct in Western Europe from hunting and pollution, populations have recovered significantly following water quality improvements.