Chugoku Blotched Salamander vs Nanhu Salamander

Hynobius sematonotos compared with Hynobius glacialis

Key Differences

• Chugoku Blotched Salamander is Vulnerable while Nanhu Salamander is Critically Endangered.

Taxonomic Classification

Rank	Chugoku Blotched Salamander	Nanhu Salamander
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Amphibia (Amphibians)	Amphibia (Amphibians)
Order same	Caudata (Caudata)	Caudata (Caudata)
Family same	Hynobiidae	Hynobiidae
Genus same	Hynobius	Hynobius
Species	Hynobius sematonotos	Hynobius glacialis

Evolutionary Relationship

Chugoku Blotched Salamander and Nanhu Salamander share a common ancestor at the Genus level: Hynobius.

Conservation Status

Chugoku Blotched Salamander

VU — Vulnerable

Nanhu Salamander

CR — Critically Endangered

Physical Characteristics

Attribute	Chugoku Blotched Salamander	Nanhu Salamander
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Chugoku Blotched Salamander

Habitat

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

Nanhu Salamander

Habitat

Inhabits tropical and subtropical moist broadleaf forests within the Indomalayan biogeographic realm.

Range

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

Chugoku Blotched Salamander

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.