IUCN threat status:

Vulnerable (VU)

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Description

A small species of Hynobius, often compared to other species H.lichenatus and H. nebulosus, but acknowledged as a separate distinct species. H. tokyoensis possesses 12 costal grooves. The vomerine teeth form a 'U'-shape. H. tokyoensis lays eggs in a pair of hard, banana-shaped egg saves. (Matsui & Nishikawa,2001)

The karyotype of Hynobius tokyoensis is 2n = 56

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