Setosamon Yeo & Ng, 2007

Tan, Zhi Wan, , Jose Christopher E. Mendoza, Yeo, & Darren C. J., 2022, Description of a new species of Setosamon Yeo & Ng, 2007 (Decapoda: Brachyura: Potamidae) from Sakon Nakhon Province, northeastern Thailand, Raffles Bulletin of Zoology 70, pp. 572-579 : 573

Genus Setosamon Yeo & Ng, 2007

Setosamon Yeo & Ng, 2007: 293 .

Type species. Potamon ubon Ng & Naiyanetr, 1993 , by original designation.

Remarks. Setosamon Yeo & Ng, 2007 , now includes three species, namely S. somchaii ( Ng & Naiyanetr, 1993) , S. ubon ( Ng & Naiyanetr, 1993) , and S. sakon , new species (see below). Setosamon species are characterised by the nearly confluent epigastric and postorbital cristae, shallow sternopleonal cavity, broadly triangular male pleon, coarse setae on the third maxillipeds and ambulatory legs, and broad, well developed dorsal flap on the G1 terminal segment. In this respect, Setosamon shares many similarities in carapace morphology with Pilosamon Ng, 1996 . However, Setosamon can be easily differentiated from Pilosamon in the G1 terminal segment being subcylindrical with its distal tip bluntly rounded and with a relatively low and swollen dorsal flap (versus G1 terminal segment subconical, tip pointed with relatively high, flat dorsal flap in Pilosamon ); and the groove for the G2 being dorsal (sternal) in position (versus groove for G2 marginal, mesial in position in Pilosamon ) ( Fig. 1A–D; Ng & Naiyanetr, 1993: figs. 40B–E, 41B–E; Ng, 1996: fig. 2; Yeo & Naiyanetr, 2010: fig. 2).

Distribution. Nakhon Phanom, Ubon Ratchathani and Sakon Nakhon Provinces, all in northeastern Thailand.