Telmatobius marmoratus, the marbled water frog, is a vulnerable species of frog in the family Telmatobiidae. The most widespread species in the genus, it is found in the Andean highlands of Bolivia, northern Chile and southern Peru. It may also occur in northwestern Argentina, but the taxonomic position of this population is unclear. This semiaquatic frog is found in and near streams, rivers, waterfalls, lakes and ponds. Among 16 adult T. marmoratus from Isla del Sol, the largest had a snout-vent length of . It is very closely related to the larger and less widespread T. gigas, and they might be conspecific. Another close relative (but clearly a separate species) is the Titicaca water frog (T. culeus) and both species are found in Lake Titicaca. References marmoratus Amphibians of the Andes Amphibians of Bolivia Amphibians of Chile Amphibians of Peru Taxonomy articles created by Polbot Amphibians described in 1841 Taxa named by André Marie Constant Duméril Taxa named by Gabriel Bibron