IUCN threat status:

Critically Endangered (CR)

Comprehensive Description

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Hynobius abei ranges from 47-71 mm in snout-vent length, and 82-122 mm in total length. It has a short and stout trunk with 11-13 costal grooves, a strongly keeled tail, and fairly short limbs with five toes on the hindlimbs. The color can be red-brown to blackish brown, with occasional flecks of silver or light blue (Goris and Maeda 2004).

This species is easily confused with H. nebulosus, H. takedai, and H. hidamontanus, which have very similar morphology (Goris and Maeda 2004).

The karyotype of Hynobius abei is 2n = 56, with 9 large, 4 medium, and 15 small pairs. Chromosomal characteristics distinguishing this species include one pair of acrocentric chromosomes in the medium-sized group and 5 pairs of bi-armed chromosomes in the small-sized group. (Seto and Matsui 1984). In addition, H. abei has a very short C-positive/R-negative band in the terminal region of the long arm of chromosome 2, as well as a very short band composed of the entire short arm of chromosome 10 (Izumisawa et al. 1990).


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