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Nyctibatrachus jog is a medium sized frog with snout-vent lengths between 33.1 - 39.0 mm. The head is wider than it is long and the body is robust. Supratympanic folding of the skin on the body is prominent from posterior corner of upper eyelid to the shoulder. Forearm is shorter than the hand. Finger and toe disks are well developed. Third finger and fourth toe discs have dorso-terminal groove with a distally rounded cover. Third finger discs with dorso-terminal groove are 3.2 times wider than the finger. Hind limbs are moderately long and the lower part of the legs is shorter than the foot length. Vocal sacs of males are poorly distinguishable externally when deflated, but expand and inflate laterally when calling. It can be further distinguished by its wrinkled dorsal skin, interrupted dorsolateral folds, weakly webbed toes, and femoral glands in males (presumably only in the breeding season as with other Nyctibatrachus (Biju et al. 2011).

Dorsum is a uniform black color with light grey patches. A pair of faint brown, longitudinal dorsal bands extends from the back of the eyelids to the middle of the dorsum. Limbs are dorsally light grey, and forelimbs, hind limbs, fingers and toes have black cross-bands. Thighs have dark grey patches and feet and webbing are dark grey. Abdominal sides are uniform grey. The throat and femoral glands are reddish-brown. Black or bluish-black liver is externally visible on the ventral side through the skin (Biju et al. 2011).

In addition, to morphological distinctions, mitochondrial DNA analysis shows N. jog with 4.2% divergence from N. petraeus in uncorrected pairwise comparisons within Nyctibatrachus (Biju et al. 2011).

The species is named after Jog Falls, where the type series was discovered (Biju et al. 2011).


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