The adult malefrog measures 17-17.9 mm in snout-vent length. The head is wider than it is long. The snout appears round. The skin of the dorsum is light gray with black marks and a yellow medial line. There is one orangespot on each side of the face. The belly and throat are gray with yellow and orange spots. There is one orange spot on each front leg.
Etymology
The specific namecardosoi honors Adão José Cardoso, a Brazilian herpetologist.