Comprehensive DescriptionRead full entry
Leptodactylus fallax is one of the world's largest frogs, with adults reaching up to 210 mm SVL (Daltry and Gray 1999). Dorsal coloration is either uniform chestnut-brown or spotted and barred. Color becomes more orange-yellow laterally and reaches a pale yellow on the ventral side. Upper tibia may have broad banding. Males lack chest spines but have distal (metacarpal) cornified spurs on each hand (Kaiser 1994).
Leptodactylus fallax can be distinguished from other members of its genus by the following characteristics: dorsolateral folds running from eye to groin; lack of breast spines; lack of light striping on upper lip; elongated hind limbs; small dorsal and lateral tubercles; tympanic fold present but not prominent, curving sharply towards the angle of the jaw; pale ventrum; terrestrial foam nest created for egg deposition, in a burrow away from water; non-feeding larvae develop within the burrows (Kaiser 1994).
Lescure and Letellier (1983) determined that “tadpoles of L. fallax appear to be the longest of any species in the genus (110 mm at Gosner stage 42) with the tail amounting to 79-84% of their total length.”