Callulops marmoratus is a species of frog in the family Microhylidae. It is endemic to Papua New Guinea and only known from its type locality, Crater Mountain Wildlife Management Area in the southwestern Chimbu Province, on the southern escarpment of the New Guinea Highlands. Description The type series includes one adult male measuring and two adult females measuring in snout–vent length. Four juveniles ranged in SVL. The head is relatively wide and the snout is short. The canthus rostralis is rounded. The tympanum is indistinct. Both fingers and toes are unwebbed but have moderately enlarged disks. Skin is smooth. The dorsum shows an irregular pattern of dark brown mottling, to which the specific name marmoratus (=Latin for "mottled") refers to. The pattern is more diffuse in the juveniles. Habitat and conservation The type series was collected from an evergreen/submontane hill forest at above sea level. One of adults was found underground while digging, whereas the other two adults were found in a ditch. Two juveniles were at entrances to small burrows. Thus, the species appears to be terrestrial or fossorial, in agreement with its morphology. There are no known threats to this species. The Crater Mountain Wildlife Management Area is a protected area. References marmoratus Endemic fauna of Papua New Guinea Amphibians of Papua New Guinea Frogs of Asia Amphibians described in 2003 Taxonomy articles created by Polbot