Adenomera lutzi

Pakaraima Mountains in west-central Guyana.^[1][3][4][5] The specific name lutzi honors Adolfo Lutz, a Brazilian medical entomologist and parasitologist^[6] and a pioneer of herpetology.^[2] Common names Lutz's tropical bullfrog and Lutz's thin-toed frog have been coined for the species.^[3]

canthus rostralis is rounded. The tympanum is distinct. The toe tips are expanded into small discs but lack circummarginal grooves.^[2] The forearms bear tubercles, and the lower surface of tarsus has distinct, white-tipped tubercles. The dorsal coloration is highly variable, and there are five major forms: (1) dark brown, grey or black ground color without or with a barely discernible pattern, (2) light–medium grey ground color with a well-defined pattern (a strongly marked dark brown–black inter-orbital bar and post-orbital ridges; chevron between shoulders almost continuous with round lumbar spots and irregular dark brown–black markings on the back), (3) as (2) but light grey, brown or reddish brown ground color and lighter, smaller, and much less evident/absent markings on the back, (4) similar to (2) but with dark brown to black mottling instead of well-defined markings on the back, and (5) dark grey to black ground color with large orange–orangish brown oblique lateral stripe, possibly with discernible darker markings. Most specimens have a white stripe that passes from the eye to the arm insertion, sometimes partly encompassing the tympanum. A narrow, yellow mid-dorsal stripe is often present but may be intermittent. The posterior surfaces of thighs are black with distinct yellow, orange, or red spotting or mottling. Males have yellow to orangish yellow throats and bellies. Vocal sac is internal.^[4]

nocturnal that lives in and on leaf litter.^[1][4] Reproduction does not depend on bodies of water.^[4]