This species has a very poorly known range in Viet Nam and Lao Peoples' Democratic Republic. In Viet Nam it is known from: Mount Ngoc Linh, Quang Nam Province; the extreme southwest of Thua Thien-Hue Province; and the Northern Truong Son Range (Annamite Highlands) (Ha Tinh and Quang Binh Provinces). In the Lao Peoples' Democratic Republic it is known from Khammouane and Boli Khamxai Provinces. Specific localities include: Po-mu Mountain, Huong Son Reserve (now known as Huong Son Forestry and Service Company), Huong Son District, Rao An Region, Ha Tinh Province, Viet Nam; Ky Anh-Ke Go, Ha Tinh Province, Viet Nam; Phong Nha-Ke Bang National Park, Quang Binh Province, Viet Nam; Mount Ngoc Linh, Tra Don Commune, Tra My District, Quang Nam Province, Viet Nam; Navang, Khammouane Province, Lao People's Democratic Republic; Phou Vang Mountain, Nakai-Nam Theun Biodiversity Conservation Area, Nakai District, Khammouane Province, Lao People's Democratic Republic; and Nape border area, Khamkeut District, Boli Khamxai Province, Lao People's Democratic Republic. The species has been found from 170-1,300 m altitude. The overall limits of its distribution remain unknown, but it presumably occurs more widely, in particular in regions between currently known localities.
Habitat and Ecology
All records of this species has been found from lowland or lower montane broad-leaved evergreen forest. The species has most often been found at night close to very slow-flowing streams or still pools. The species is presumed to be a larval developer. At least some individuals were found in fragments of forest that remained in ravines, within areas otherwise heavily disturbed. However, its adaptability to secondary habitats remains unknown.
No information is currently available.
Some of the sites at which this species is known to occur have undergone heavy disturbance due to small-scale timber and firewood extraction, and it is not known whether or not the species can persist long-term in the fragmented forest remaining in ravines. It is possibly under threat, therefore, from forest loss, but the small size of the species presumably allows it to thrive in smaller fragments of forest than is often the case larger species of amphibians.
This species is known from Phong Nha-Ke Bang National Park and and Ke Go Nature Reserve in Viet Nam, and Nakai-Nam Theun Biodiversity Conservation Area in Lao People's Democratic Republic. It has also been recorded from the Green Corridor Project area in Viet Nam (which is a proposed corridor linking Bach Ma National Park with Phong Dien Nature Reserve). Given that threats to the habitat of this species are ongoing despite current management, there is a need for improved protected area management and law enforcement.
Raoul Bain 2006. Microhyla marmorata. In: IUCN 2014