They are 6 to 8 incheslong with a darkish gray-brown to black ,mottled body which is flattened and rectangular in shape.
Fingers are free with a tactile organ shaped like a rayed star on tips.
The Surinam toad has large powerful rear legs with webbed toes which are clawless. Tiny black eyes are lidless and appear to have been put in the wrong place. Upper surface covered with small, pointed protuberances. Female has an extended, slightly tubular ovipositor. Amazon region in South America, Peru, Guyana, Surinam, Brazil.