Onaga-ei vs Aka ei

Hemitrygon bennettii compared with Hemitrygon akajei

Key Differences

• Onaga-ei is Vulnerable while Aka ei is Near Threatened.

Taxonomic Classification

Rank	Onaga-ei	Aka 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	Dasyatidae	Dasyatidae
Genus same	Hemitrygon	Hemitrygon
Species	Hemitrygon bennettii	Hemitrygon akajei

Evolutionary Relationship

Onaga-ei and Aka ei share a common ancestor at the Genus level: Hemitrygon.

Conservation Status

Onaga-ei

VU — Vulnerable

Aka ei

NT — Near Threatened

Physical Characteristics

Attribute	Onaga-ei	Aka ei
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Onaga-ei

Habitat

Native to Asia, inhabiting ecosystems characteristic of the region.

Range

Found in Taiwan. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Aka ei

Habitat

Native to Asia, inhabiting ecosystems characteristic of the region.

Range

Found in Taiwan. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Onaga-ei

The Bennett's cowtail (Hemitrygon bennettii) is a species in the genus Hemitrygon. It is currently classified as Vulnerable on the IUCN Red List. Native to Asia, inhabiting ecosystems characteristic of the region.

Aka ei

The Brown Stingray (Hemitrygon akajei) is a species in the genus Hemitrygon. It is currently classified as Near Threatened on the IUCN Red List. Native to Asia, inhabiting ecosystems characteristic of the region.

Shared Countries

Both species can be found in 1 countries:

🇹🇼 Taiwan