# Gecarcinucidae

The Gecarcinucidae are a family of true freshwater crabs. They are found throughout South Asia, Southeast Asia and New Guinea, with a single genus found in Australia.

## Taxonomy

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.
The Gecarcinucidae are thought to have originated in the Indian subcontinent when it was an island continent in the Paleogene, despite not being of ancient Gondwanan origins themselves (unlike other lineages that are thought to have originated in Insular India). Divergence estimates indicate that the Gecarcinucidae originate from Southeast Asian ancestors that dispersed to India during the middle Eocene, before India collided with Asia. This is thought to have occurred due to India drifting close enough to Southeast Asia to allow for biotic exchange between both regions. As the Gecarcinucidae are a freshwater group that could not disperse via marine habitats, this indicates that temporary land bridges may have formed in the Eocene between India and Southeast Asia, allowing for the dispersal of freshwater organisms to India while it was still isolated. Following the India-Asia collision, the Gecarcinucidae dispersed back into mainland Asia, and from there to Australasia.
The Gecarcinucidae are thought to be the sister group to the Potamoidea (the superfamily comprising the Potamidae and Potamonautidae).

## Genera

* Adeleana Bott, 1969
* Arachnothelphusa Ng, 1991
* Aradhya Pati, Bajantri & Hegde, 2023
* Austrothelphusa Bott, 1969
* Bakousa Ng, 1995
* Balssiathelphusa Bott, 1969
* Baratha Bahir & Yeo, 2007
* Barytelphusa Alcock, 1909
* Ceylonthelphusa Bott, 1969
* Clinothelphusa Ng & Tay, 2001
* Coccusa S. H. Tan & Ng, 1998
* Currothelphusa Ng, 1990
* Cylindrotelphusa Alcock, 1909
* Esanthelphusa Naiyanetr, 1994
* Gecarcinucus Milne Edwards, 1844
* Geelvinkia Bott, 1974
* Geithusa Ng, 1989
* Ghatiana Pati & Sharma, 2014
* Globitelphusa Alcock, 1909
* Gubernatoriana Bott, 1970
* Guinothusa Yeo & Ng, 2010
* Heterothelphusa Ng & Lim, 1986
* Holthuisana Bott, 1969
* Inglethelphusa Bott, 1970
* Irmengardia Bott, 1969
* Kani Kumar, Raj & Ng, 2017
* Lamella Bahir & Yeo, 2007
* Lepidopthelphusa Colosi, 1920
* Liotelphusa Alcock, 1909
* Mahatha Ng & Tay, 2001
* Mainitia Bott, 1969
* Maydelliathelphusa Bott, 1969
* Mekhongthelphusa Naiyanetr, 1985
* Migmathelphusa O. K. S. Chia & Ng, 2006
* Nautilothelphusa Balss, 1933
* Niasathelphusa Ng, 1991
* Oziotelphusa Muller, 1887
* Parathelphusa H. Milne Edwards, 1853
* Pastilla Ng & Tay, 2001
* Perbrinckia Bott, 1969
* Perithelphusa Man, 1899
* Phricotelphusa Alcock, 1909
* Pilarta Bahir & Yeo, 2007
* Rouxana Bott, 1969
* Salangathelphusa Bott, 1968
* Sartoriana Bott, 1969
* Sayamia Naiyanetr, 1994
* Sendleria Bott, 1969
* Siamthelphusa Bott, 1968
* Snaha Bahir & Yeo, 2007
* Sodhiana Yeo & Ng, 2012
* Somanniathelphusa Bott, 1968
* Spiralothelphusa Bott, 1968
* Stygothelphusa Ng, 1989
* Sundathelphusa Bott, 1969
* Syntripsa O. K. S. Chia & Ng, 2006
* Terrathelphusa Ng, 1989
* Thaksinthelphusa Ng & Naiyanetr, 1993
* Thelphusula Bott, 1969
* Torhusa Ng, 1997
* Travancoriana Bott, 1969
* Vanni Bahir & Yeo, 2007
* Vela Bahir & Yeo, 2007