Aki-sansyou-uwo vs Chugoku-buchi-sanshou-uwo

Hynobius akiensis compared with Hynobius sematonotos

Key Differences

• Aki-sansyou-uwo is Endangered while Chugoku-buchi-sanshou-uwo is Vulnerable.

Taxonomic Classification

Rank	Aki-sansyou-uwo	Chugoku-buchi-sanshou-uwo
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class same	Amphibia (両生類)	Amphibia (両生類)
Order same	Caudata (有尾目)	Caudata (有尾目)
Family same	Hynobiidae	Hynobiidae
Genus same	Hynobius	Hynobius
Species	Hynobius akiensis	Hynobius sematonotos

Evolutionary Relationship

Aki-sansyou-uwo and Chugoku-buchi-sanshou-uwo share a common ancestor at the Genus level: Hynobius.

Conservation Status

Aki-sansyou-uwo

EN — Endangered

Chugoku-buchi-sanshou-uwo

VU — Vulnerable

Physical Characteristics

Attribute	Aki-sansyou-uwo	Chugoku-buchi-sanshou-uwo
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Aki-sansyou-uwo

Habitat

Typically found in freshwater habitats, moist forests, and wetlands.

Chugoku-buchi-sanshou-uwo

Habitat

Typically found in freshwater habitats, moist forests, and wetlands.

Aki-sansyou-uwo

The Aki Salamander (Hynobius akiensis) is a species in the genus Hynobius. It is currently classified as Endangered on the IUCN Red List. Typically found in freshwater habitats, moist forests, and wetlands.

Chugoku-buchi-sanshou-uwo

The Chugoku Blotched Salamander (Hynobius sematonotos) is a Vulnerable salamander endemic to the Chugoku region of western Honshu, Japan. It belongs to the family Hynobiidae, the most basal family of living salamanders, with the greatest diversity concentrated in East Asia. Like other Hynobius species, H. sematonotos reproduces externally: females deposit paired egg sacs in small streams or water bodies, where males fertilize them externally before larvae hatch and develop in the water. Adults are terrestrial outside the breeding season, living under logs and leaf litter in cool forest habitats. The Chugoku Blotched Salamander is named for the distinctive blotched or marbled pattern of its dorsal coloration. Its Vulnerable status reflects ongoing habitat loss from deforestation, urbanization, and stream modification in the Chugoku region, which has experienced substantial land-use change. The species' dependence on small headwater streams for breeding makes it particularly sensitive to water quality degradation and hydrological alteration. Like many Japanese hynobiids, it faces additional threats from invasive species and pollution. Conservation of forested headwater catchments is essential for maintaining viable populations of this and related endemic Japanese salamanders.