This species is known only from Thua Thien-Hue, Lam Dong, Gia Lai, Dak Lak, and Lam Dong Provinces, southern Viet Nam (Andersson 1942, Nguyen et al. 2009). The species' elevation limits have not been recorded, but Dalat (the type locality) is characterized by elevations around 1,500 m Asl. This is unlikely to represent the actual limits of the species' range; similar habitat and elevations to those in its known localities occur in adjacent parts of southern and central Viet Nam as well as south-eastern Lao PDR. Further surveys in these areas may uncover its presence there, therefore its range has been projected beyond known sites to include these areas of suitable habitat. This species' EOO is 73,960 km2, and its range consists of four threat-defined locations.
Habitat and Ecology
There are no records on the ecology and habitat use of this species, however it presumably reproduces in still to slow-flowing water and occurs in the general vicinity of it throughout the year, as with other Occidozyga species.
Almost nothing is known about the size and trends of this species' population except that it has been detected in relatively few surveys (Andersson 1942, Nguyen et al. 2009). Deforestation continues to affect habitat in the species' predicted range (Meyfroidt and Lambin 2008, Sodhi et al. 2009, Meyfroidt et al. 2013), and is very likely causing declines. Surveys are needed to determine its relative abundance and population trends.
Habitat loss and degradation due to the effects of rapidly expanding agriculture is an ongoing threat to biodiversity throughout Viet Nam (Sodhi et al. 2009). This is a particularly pressing threat in the Central Highlands; 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. This species is thus likely threatened by habitat loss, however the extent of this is not known and warrants further investigation.
This species has not been reported from any protected area, however much of its predicted range occurs within Rung Thong Da Lat Cultural and Historical Site, Phuoc Binh Proposed Nature Reserve, and Bidoup-Nui Ba Nature Reserve. The species may be represented in some of these, however many of these areas have been extensively surveyed and it has not yet been detected (Le 2011, Nguyen and Kuznetsov 2011, J. Rowley pers. comm. December 2015).
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 occurs in any protected areas would inform conservation decisions.
Red List Status
Least Concern (LC)
Listed as Least Concern as this species is relatively widespread, with an extent of occurrence (EOO) of 73,960 km2.
The relationship of this species with Occidozyga laevis and O. martensii is unclear. It was placed in Occidozyga by Inger (1996). See note under O. martensii.
IUCN SSC Amphibian Specialist Group 2017. Occidozyga vittata. The IUCN Red List of Threatened Species 2017: e.T58416A86860189. http://dx.doi.org/10.2305/IUCN.UK.2017-2.RLTS.T58416A86860189.en .Downloaded on 15 November 2018