Dwarf round ray vs Oguro-usu-ei

Urotrygon nana compared with Urotrygon microphthalmum

Key Differences

• Dwarf round ray is Near Threatened while Oguro-usu-ei is Critically Endangered.

Taxonomic Classification

Rank	Dwarf round ray	Oguro-usu-ei
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class same	Elasmobranchii	Elasmobranchii
Order same	Myliobatiformes (トビエイ目)	Myliobatiformes (トビエイ目)
Family same	Urotrygonidae	Urotrygonidae
Genus same	Urotrygon	Urotrygon
Species	Urotrygon nana	Urotrygon microphthalmum

Evolutionary Relationship

Dwarf round ray and Oguro-usu-ei share a common ancestor at the Genus level: Urotrygon.

Conservation Status

Dwarf round ray

NT — Near Threatened

Oguro-usu-ei

CR — Critically Endangered

Physical Characteristics

Attribute	Dwarf round ray	Oguro-usu-ei
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—