This species occurs on six islands in the Seychelles: Mahé, Félicité, Sainte Anne, Silhouette, Praslin, and La Digue. It occurs from sea level well up into the rainforest (to about 600 m). Using its range as a proxy, its extent of occurrence (EOO) has been estimated as 232 km2.
Habitat and Ecology
The species lives in the pristine rainforest on the hills of the islands. However, it also tolerates a degree of habitat disturbance, as it has been found in disturbed sites on the coastal plateau. It burrows in soil, leaf-litter, and trash piles. It breeds by larval development in streams and pools.
It is locally abundant; was last seen in 2000 but has not been seen or searched for since (J. Gerlach pers. comm November 2012).
Due to its adaptability to habitat disturbance, it is probably not affected by deforestation and is unlikely to be threatened.
While the species is known from protected areas, these are not effectively managed. It occurs in the Morne Seychellois National Park on Mahé Island, Praslin National Park on Praslin Island and the Silhouette National Park on Silhouette Island. The Silhouette National Park is currently unmanaged because the Silhouette Conservation Project previously run there by Nature Protection Trust of Seychelles was closed down in 2010; its purpose was research and conservation of all non-marine biodiversity, including research on caecilians and a conservation focus on controlling invasive species and restoring habitats; all such action has currently ceased (J. Gerlach pers. comm. November 2012). Further research is needed on the species' natural history.
Red List Status
Least Concern (LC)
Listed as Least Concern despite a small estimated extent of occurrence (EOO) of 232 km2 as it is generally common, adaptable, and does not appear to be in decline.
Grandisonia diminutiva was considered as a junior synonym of G. larvata following Nussbaum and Wilkinson (1989). It is now considered a synonym of Grandisonia sechellensis by Wilkinson and Nussbaum (2006), hence it is no longer included here.
IUCN SSC Amphibian Specialist Group, 2013. Grandisonia larvata. The IUCN Red List of Threatened Species 2013: e.T45488934A20998322. http://dx.doi.org/10.2305/IUCN.UK.2013-1.RLTS.T45488934A20998322.en .Downloaded on 15 February 2019