This species is currently known only from a single site at 1,316 m asl in Ngoc Linh Nature Reserve, Dak Glei District, Kon Tum Province, Viet Nam (Rowley et al. 2010). This is unlikely to represent the true limits of its range as adjacent forested areas are contiguous with the species' known locality and its presence is expected northward in southern Song Thanh Nature Reserve as well as westward near the Lao border, outside of either protected area. Therefore, further surveys are needed to confirm this and may possibly detect the species even further afield. However, as most congeners do not occupy very expansive ranges, the true range of this species is not expected to occupy all the available suitable habitat. Pending confirmation of its true range, it has been mapped to the forested area between 1,000–1,600 m asl that immediately surrounds the type locality. As such, its estimated extent of occurrence (EOO) is 135 km2 and represents only one threat-defined location.
Habitat and Ecology
This species is associated with steep, undisturbed hilly evergreen forest and occupies leaf litter, rocks and riparian vegetation adjacent to shallow, stony streams. Neither females, nor eggs or larvae have been observed (Rowley et al. 2010), but a free-swimming larval stage is expected for this species, as is the case in all other Leptolalax species for which larvae are known (J. Rowley pers. comm. February 2015). Some of the species' habitat may be disturbed if it occurs outside well-protected areas, however this is uncertain.
The species was described from 15 individuals and observed in relative abundance at the type locality (Rowley et al. 2010). Its population may be in decline due to habitat loss, however further surveys are required to determine population size and trends.
Habitat loss and degradation, particularly as a result of the conversion of forest to agricultural land to grow cash crop plantations (eg. rubber, coffee and tea) is an ongoing threat throughout the Central Highlands (Meyfroidt and Lambin 2008, Meyfroidt et al. 2013), and would likely be causing declines in this species if it occurs outside of the protected area from which it is known. However, the species is currently known only from within a protected area characterized by steep terrain and so habitat loss may not be an immediate threat to this locality (J. Rowley pers. comm. February 2014).
The species is known to occupy Ngoc Linh Nature Reserve (Rowley et al. 2010), and probably also occurs in Song Thanh Nature Reserve.
There is considerable uncertainty about its range, ecology, population trends, and current threats. Therefore, further surveys and research are warranted to to better understand its habitat use and ecology and to inform conservation decisions and a threat category for this species.
Red List Status
Data Deficient (DD)
Listed as Data Deficient as this species is new to science and there are too few data pertinent to its range for accurate assignment to any particular category.
IUCN SSC Amphibian Specialist Group 2017. Leptolalax croceus. The IUCN Red List of Threatened Species 2017: e.T48101592A48101602. http://dx.doi.org/10.2305/IUCN.UK.2017-3.RLTS.T48101592A48101602.en .Downloaded on 14 November 2018