IUCN threat status:

Least Concern (LC)

Comprehensive Description

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Hynobius tsuensis has a snout to vent length of 58-75 mm and a total length of 109-142 mm. It normally has 13 costal grooves. Its limbs are relatively short and when they are adpressed to the flank, there is a gap of 1-3 costal grooves between the fore and hind toes. Its hindfeet have 5 toes. There is sexual dimorphism in color. Females are flecked with dark brown spots on a yellowish background. Males are flecked with purplish spots on a blackish background. The vent of both sexes is lighter in color, and both sexes have an orange stripe on the upper and lower edges of the tail. The stripe tends to be wider in females (Goris and Maeda 2004).

Hynobius nebulosus also has a bright stripe on both edges of its tail, but its flecks of color are very tiny compared to those of H. tsuensis, and the ranges of the two are completely separate (Goris and Maeda 2004).


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