This species is currently known only from 1,210 m Asl at a single locality in Kon Tum Province, central Viet Nam (Orlov et al. 2006). This is unlikely to represent the actual limits of the species' range as similar habitat and elevations to those in its known locality occur in adjacent areas including south into north-eastern Gia Lai Province. Further surveys in these areas may uncover its presence, therefore its range has been projected beyond known sites to include these areas of suitable habitat. This species' EOO is 2,736 km2, which consists of two threat-defined locations.
Habitat and Ecology
This species is associated with montane primary forest and has been observed in trees 4m above the ground (Orlov et al. 2006). The species is a phytotelm breeder and reproduction presumably commences prior to April, during which time three adults including at least one male as well as tadpoles and metamorphs of different stages have been observed together in a tree hole partly filled with 20 cm of water (Orlov et al. 2006).
Nothing is currently known about the size of this species' population except that it is known from only three adults and a number of juvenile individuals that were detected in a single survey (Orlov et al. 2006), despite the areas surrounding its type locality having been surveyed many times (J. Rowley pers. comm. December 2015). It is unclear whether this is due to true rarity or cryptic behaviour, and further research is needed to determine the species' true abundance. Deforestation continues to affect habitat in the species' range (Meyfroidt and Lambin 2008, Sodhi et al. 2009, Meyfroidt et al. 2013), and is very likely causing some declines.
Habitat loss and degradation due to the effects of rapidly expanding agriculture is an ongoing threat to biodiversity throughout Southeast Asia (Sodhi et al. 2009). In the Central Highlands of Viet Nam large areas of forest are converted to agricultural land to grow cash crop plantations (e.g. rubber, coffee and tea) (Meyfroidt and Lambin 2008, Meyfroidt et al. 2013). Recent satellite imagery reveals areas of land cleared for agriculture throughout parts of this species' range. The construction of roads in this area has also degraded habitat (T. Nguyen pers. comm. December 2015).
This species is not currently known from any protected area. Kon Ka Kinh National Park is included in a section of its predicted range; the species may occur here, however previous surveys of the area (e.g. Ziegler et al. 2008) have not detected it.
Protection of habitat at the species' known locality may be warranted if it is not found to occur in any nearby protected area following further research. However, addressing the lack of data is the first step towards ensuring this species' long-term persistence.
Further research on its true distribution, threats, the size and trends of its population, and whether it is represented in any protected areas would inform conservation decisions.
Red List Status
Listed as Endangered as this species has an extent of occurrence (EOO) of only 2,736 km2, is expected from two threat-defined locations, and is facing a continuing decline in the quality of parts of its habitat.
IUCN SSC Amphibian Specialist Group 2017. Theloderma ryabovi. The IUCN Red List of Threatened Species 2017: e.T136002A87450322. http://dx.doi.org/10.2305/IUCN.UK.2017-2.RLTS.T136002A87450322.en .Downloaded on 23 January 2019