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Parathelphusa
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Parathelphusa
Parathelphusa is a genus of freshwater crabs in the family Gecarcinucidae and subfamily Parathelphusinae, primarily distributed across Southeast Asia, including countries such as Indonesia, the Philippines, and Singapore. Southeast Asia has some of the highest diversity of freshwater crabs around the world. Some species in this genus are endemic to Singapore, such as the critically endangered Parathelphusa reticulata (swamp forest crab) which became more well-known after its feature on a series of crab stamps by the Singapore Philatelic Bureau in 1992.
This genus comprises over 49 recognised species, with notable diversity in morphology and habitat preferences. For example, the Parathelphusa reticulata gets up to 4cm in size and lives in the swamp forest habitat, while the Parathelphusa maculata gets up to 6cm in size and lives in streams and nature reserves. The Parathelphusa pantherina (panther crab) is known for its striking colouration, with a patterned carapace resembling a panther's spots.
Despite their ecological importance, many species of Parathelphusa face the threats of habitat destruction, pollution, and excessive harvesting. For instance, Parathelphusa reticulata is critically endangered due to habitat loss in Singapore's swamp forests. Conservation efforts, including ex-situ breeding programs, are vital to preserving these unique freshwater crabs and their ecosystems.
Parathelphusa is a genus of freshwater crabs classified under the subfamily Parathelphusinae within the family Gecarcinucidae. The genus was erected by Henri Milne Edwards in Mémoire sur la famille des ocypodiens in 1853, with Parathelphusa tridentata designated as its type species by Mary Jane Rathbun (1905). The genus was gendered feminine.
The following distinctive traits characterise the genus: It has a transverse, smooth carapace with its length almost as long as its width. It has a triangularly-shaped median lobe on its rear margin of epistome. Its anterolateral edges have several teeth. Males have a T-shaped abdomen and exhibit sexual dimorphism, with larger chelae used for territorial behaviour.
Initially, taxonomic revisions by R. Bott (1970) recognised 10 species in Sulawesi alone, but subsequent studies expanded this to 47 species distributed across Southeast Asia, including Sulawesi, Bali, Lombok, and parts of Philippines. Today, there are 49 recognised species under this genus.
The list of recognised species are:
According to the Global Biodiversity Information Facility (GBIF), there have been 996 known occurrences of Parathelphusa between 1841–2025. This map shows how these occurrences are distributed globally:
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Parathelphusa
Parathelphusa is a genus of freshwater crabs in the family Gecarcinucidae and subfamily Parathelphusinae, primarily distributed across Southeast Asia, including countries such as Indonesia, the Philippines, and Singapore. Southeast Asia has some of the highest diversity of freshwater crabs around the world. Some species in this genus are endemic to Singapore, such as the critically endangered Parathelphusa reticulata (swamp forest crab) which became more well-known after its feature on a series of crab stamps by the Singapore Philatelic Bureau in 1992.
This genus comprises over 49 recognised species, with notable diversity in morphology and habitat preferences. For example, the Parathelphusa reticulata gets up to 4cm in size and lives in the swamp forest habitat, while the Parathelphusa maculata gets up to 6cm in size and lives in streams and nature reserves. The Parathelphusa pantherina (panther crab) is known for its striking colouration, with a patterned carapace resembling a panther's spots.
Despite their ecological importance, many species of Parathelphusa face the threats of habitat destruction, pollution, and excessive harvesting. For instance, Parathelphusa reticulata is critically endangered due to habitat loss in Singapore's swamp forests. Conservation efforts, including ex-situ breeding programs, are vital to preserving these unique freshwater crabs and their ecosystems.
Parathelphusa is a genus of freshwater crabs classified under the subfamily Parathelphusinae within the family Gecarcinucidae. The genus was erected by Henri Milne Edwards in Mémoire sur la famille des ocypodiens in 1853, with Parathelphusa tridentata designated as its type species by Mary Jane Rathbun (1905). The genus was gendered feminine.
The following distinctive traits characterise the genus: It has a transverse, smooth carapace with its length almost as long as its width. It has a triangularly-shaped median lobe on its rear margin of epistome. Its anterolateral edges have several teeth. Males have a T-shaped abdomen and exhibit sexual dimorphism, with larger chelae used for territorial behaviour.
Initially, taxonomic revisions by R. Bott (1970) recognised 10 species in Sulawesi alone, but subsequent studies expanded this to 47 species distributed across Southeast Asia, including Sulawesi, Bali, Lombok, and parts of Philippines. Today, there are 49 recognised species under this genus.
The list of recognised species are:
According to the Global Biodiversity Information Facility (GBIF), there have been 996 known occurrences of Parathelphusa between 1841–2025. This map shows how these occurrences are distributed globally:
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