Hyloxalus marmoreoventris is a species of frogs in the family Dendrobatidae. It is endemic to Ecuador and only known from its type locality on the eastern slope of the Andes in the Tungurahua Province. It is a little known species which possibly has not been observed after it was first described. Description The holotype, a male, measures in snout–vent length and has a spotted venter (which distinguishes it from the similar Hyloxalus fallax). Females are unknown. Habitat and conservation Hyloxalus marmoreoventris inhabits premontane forest at asl. It is threatened by habitat loss. The forest at the type locality has already been cleared, although forests remain in the vicinity and within protected areas (Llanganates and Sangay National Parks). References marmoreoventris Amphibians of the Andes Amphibians of Ecuador Endemic fauna of Ecuador Amphibians described in 1991 Taxonomy articles created by Polbot