[3] The specific name poecilus is derived from the Greek poikolos, meaning "pied" or "blotched", in reference to diagnostic pattern on rear of the thigh.

Skin is dorsally shagreened; indistinct dorsolateral folds are present.

The rear of the thigh in preserved specimens shows irregular light blotches (presumably yellow in life) on dark brown background.

Breeding takes place along small, clear, rocky streams where the tadpoles cling to the rocks, feeding on lithophytic algae.

It is present in the Lanjak Entimau Wildlife Sanctuary and in the Betung-Kerikum National Park.