The Sri Lanka tree crab, (''Perbrinckia scansor''), is a species of

freshwater crab Around 1,300 species of freshwater crabs are distributed throughout the tropics and subtropics, divided among eight families. They show direct development and maternal care of a small number of offspring, in contrast to marine crabs, which rele ...

s of the family

Gecarcinucidae The Gecarcinucidae are a family of true freshwater crabs. The family Parathelphusidae is now demoted to the rank of subfamily, as the Parathelphusinae, within the Gecarcinucidae. "Family" Parathelphusidae is now considered as a junior synonym. ...

that is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found els ...

Sri Lanka Sri Lanka (, ; si, ශ්‍රී ලංකා, Śrī Laṅkā, translit-std=ISO (); ta, இலங்கை, Ilaṅkai, translit-std=ISO ()), formerly known as Ceylon and officially the Democratic Socialist Republic of Sri Lanka, is an ...

. It is the only known tree climbing freshwater crab found in the country. The crab is discovered from 11 localities from Sri Lanka throughout

Kalu River Kalu Ganga ( si, කළු ගඟ; literally: Black River) is a river in Sri Lanka. Measuring in length, the river originates from Sri Padhaya and reach the sea at Kalutara. The Black River flows through the Ratnapura and the Kalutara District a ...

, Walawe River and Gin River basins. Adult are known to survive well in rainwater-filled tree hollows of trees such as ''

Shorea Fruit of a ''Shorea'' species ''Shorea'' is a genus of about 196 species of mainly rainforest trees in the family Dipterocarpaceae. The genus is named after Sir John Shore, the governor-general of the British East India Company, 1793–1798. Th ...

'' sp., ''

Artocarpus ''Artocarpus'' is a genus of approximately 60 trees and shrubs of Southeast Asian and Pacific origin, belonging to the mulberry family, Moraceae. Most species of ''Artocarpus'' are restricted to Southeast Asia; a few cultivated species are more ...

'' sp., ''

Dillenia ''Dillenia'' is a genus of flowering plants in the family Dilleniaceae, native to tropical and subtropical regions of southern Asia, Australasia, and the Indian Ocean islands. The genus is named after the German botanist Johann Jacob Dillenius, ...

'' sp., ''

Garcinia ''Garcinia'' is a genus of flowering plants in the family Clusiaceae native to Asia, America, Australia, tropical and southern Africa, and Polynesia. The number of species is disputed; Plants of the World Online (POWO) recognise up to 400. Co ...

'' sp., ''

Myristica ''Myristica'' is a genus of trees in the family Myristicaceae. There are over 150 species, distributed in Asia and the western Pacific. The type species of the genus, and the most economically important member, is ''Myristica fragrans'' (the nut ...

'' sp., and ''

Gyrinops walla ''Gyrinops walla'' is a species in the genus '' Gyrinops'' of the family Thymelaeaceae. It was described by Joseph Gaertner. The tree grows up to 15 m high. Its bark is thin and brownish-grey color. Leaves are 1–6 mm long and yellowis ...

''. Females with youngs can be seen during February and March on the ground, never within tree hollows. The known predators are

Greater coucal The greater coucal or crow pheasant (''Centropus sinensis''), is a large non-parasitic member of the cuckoo order of birds, the Cuculiformes. A widespread resident in the Indian Subcontinent and Southeast Asia, it is divided into several subspe ...

White-throated kingfisher The white-throated kingfisher (''Halcyon smyrnensis'') also known as the white-breasted kingfisher is a tree kingfisher, widely distributed in Asia from the Sinai east through the Indian subcontinent to China and Indonesia. This kingfisher is a ...

Sri Lanka grey hornbill The Sri Lanka grey hornbill (''Ocyceros gingalensis'') is a bird in the hornbill family and a widespread and common endemic (ecology), endemic resident breeder in Sri Lanka. Hornbills are a family of tropical near-passerine birds found in the Ol ...

and

Eurasian otter The Eurasian otter (''Lutra lutra''), also known as the European otter, Eurasian river otter, common otter, and Old World otter, is a semiaquatic mammal native to Eurasia. The most widely distributed member of the otter subfamily (Lutrinae) of ...

. The species is categorized as least concern by IUCN, but the habitats are gradually declining. The water bodies of central hills are invaded by exotic species of fish and other aquatic flora and usage of many areas for human habitations are known to harm the animal. They are also collected illegally and used for many purposes local and overseas.

References

External links

photos of Perbrinckia scansorRange extension of Perbrinckia scansor (Crustacea) in Sri Lanka
Gecarcinucoidea Freshwater crustaceans of Asia Crustaceans of Sri Lanka Endemic fauna of Sri Lanka {{crab-stub