IUCN threat status:

Least Concern (LC)

Comprehensive Description

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Hynobius nigrescens has a snout to vent length of 60-80 mm and a total length of 120-190 mm. It is a relatively large hynobiid salamander with a long, broad tail that comprises half its total length. Its limbs are also long and when they are adpressed to the flank, the toes of the fore- and hindlimbs overlap by a space of 1-3 costal grooves. It has 11 very deep costal grooves and a deep dorsal groove as well. The dorsal surface is uniformly black, flecked with tiny light dots, and on its ventral side the light color predominates.

Hynobius lichenatus often occurs in sympatry and may even breed in the same ponds, but H. nigrescens can be distinguished by the combination of relatively large size, deep costal and dorsal grooves, and very dark coloration (Goris and Maeda 2004).

In the past, the Sadogashima population has been treated as a separate species or subspecies, but the validity of this classification has been challenged (Goris and Maeda 2004).


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