Geosesarma penangense ( Tweedie, 1940 )

Ng, Peter K. L., , Martyn E. Y. Low, Clark, & Paul F., 2022, Historical notes on various collectors of unidentified freshwater crabs (Crustacea: Decapoda: Brachyura) from the Malay Peninsula and Borneo, with descriptions of two new species of Isolapotamon Bott, 1968 Potamidae), Raffles Bulletin of Zoology 70, pp. 550-571 : 565

Geosesarma penangense ( Tweedie, 1940)

Sesarma penangense Tweedie, 1940: 106 , text-fig. 10, pl. 24, fig. 4.

Material examined. 1 male, 1 female, 1 ovig. female ( NHM ex. 1898.11.28 now 2022.912–914), 610 m asl, Penang, Peninsular Malaysia, coll. Capt. S.S. Flower, March 1896 .

Remarks. The species was first described from Penang Hill ( Tweedie, 1940) and has since then been reported and redescribed by Ng (1988). Geosesarma penangense is superficially similar to G. peraccae ( Nobili, 1903b) from Singapore, but it has the dorsal surface of the carapace relatively smoother and the chitinous distal part of the G1 is shorter, more strongly spatulate and curved ( Ng, 1988: 120, 130, fig. 58D, E).