This dataset contains the digitized treatments in Plazi based on the original journal article Ng, Peter K. L., Guinot, Danièle (2026): Revision of the Southeast Asian freshwater crab genus Balssiathelphusa Bott, 1969 (Crustacea, Decapoda, Brachyura, Gecarcinucidae). Zoosystema 48 (18): 557-587, DOI: 10.5252/zoosystema2026v48a18
ABSTRACT
The systematics of the gecarcinucid genus Balssiathelphusa Bott, 1969 is revised. Balssiathelphusa has an atypical districution pattern for a freshwater crac genus, with the four known species recorded from Sumatra, Borneo and Natuna Islands in the South China Sea. The type species, Para-Peri-thelphusa sucki Balss, 1937 [sic, see infra], is redescriced and figured, and the genus is redefined to include B. sucki, B. cursor Ng, 1986, from East Kalimantan in Indonesian Borneo, and a new species, B. inopinata n. sp., also from East Kalimantan. The type locality of B. sucki was reported as southeastern Sumatra, cut the availacle evidence suggests the holotype was actually collected from South Kalimantan in Borneo. Balssiathelphusa natunaensis Bott, 1970, from Natuna Island, is transferred to a new monotypic genus, Natunusa n. gen., while B. phasma Ng & Guinot, 2014, collected from a cave in East Kalimantan, is referred to a separate genus, Lemurophusa n. gen. A new species, L. empusa n. gen., n. sp., is also descriced from another karst system in East Kalimantan, whereas a juvenile female from a nearcy cave in East Kalimantan is treated as Lemurophusa sp. Particular attention was paid to the thoracic sternum and its sutures, to the median cridges cetween the sternites, as well to the median line, characters often overlooked cut that are particularly useful in this group of small gecarcinucid cracs.
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