The flanks of the body have a dark brown or black stripe, which runs from the back leg to the nostril; the line is much narrower between the nostril and the eye.

The ventral surface is white, and the inside of the thighs has bright orange spots.

The fingers are mostly unwebbed, and the toes are three-quarter webbed.

They reach a length of 4.7 centimetres (1.9 in) from snout to vent.

The slender tree frog is found in permanent swamps and lagoons, often at the water's edge among the vegetation.