On the genus Flabellamon Ng, 1996, with descriptions of two new species (Crustacea: Brachyura: Potamidae) Author Tan, Zhi Wan 0000-0002-9878-6958 Lee Kong Chian Natural History Museum, Faculty of Science, National University of Singapore, 2 Conservatory Drive, 117377, Republic of Singapore. & Department of Biological Sciences, Faculty of Science, National University of Singapore, 16 Science Drive 4, Singapore 117558, Republic of Singapore. tzw@u.nus.edu Author Yeo, Darren C. J. 0000-0003-2669-4349 Lee Kong Chian Natural History Museum, Faculty of Science, National University of Singapore, 2 Conservatory Drive, 117377, Republic of Singapore. & Department of Biological Sciences, Faculty of Science, National University of Singapore, 16 Science Drive 4, Singapore 117558, Republic of Singapore. darrenyeo@nus.edu.sg text Zootaxa 2024 2024-07-04 5476 1 434 446 http://dx.doi.org/10.11646/zootaxa.5476.1.32 journal article 10.11646/zootaxa.5476.1.32 1175-5326 12681996 078CE548-C895-4F3F-8965-66AB38C7388E Key to species of Flabellamon 1. G1 terminal segment with subdistal part of lateral margin gently tapered......................................... 2 – G1 terminal segment with subdistal part of lateral margin truncate.............................................. 3 2. Carapace with areas behind epigastric and postorbital cristae weakly rugose and granulose; anterolateral margin relatively less convex; external orbital tooth strongly developed, acute. Male pleonal somite 6 lateral margins strongly convex. G1 terminal segment about 3.2 times longer than broad, dorsal flap about 0.3 times length of terminal segment, with dorsal flap apex at proximal one-third of flap............................................................... F. ngankee sp. nov. – Carapace with areas behind epigastric and postorbital cristae strongly rugose and granulose; anterolateral margin relatively more convex; external orbital tooth less strongly developed, more obtuse. Male pleonal somite 6 lateral margins weakly convex. G1 terminal segment about 3.9 times longer than broad, dorsal flap about 0.17 times length of terminal segment, with dorsal flap apex at proximal and distal one-third of flap, appearing flat topped.......... F. wanchaii Takeda, Sanpool & Intapan, 2019 3. Carapace epibranchial tooth relatively blunt, low. G1 terminal segment appearing almost twisted longitudinally, dorsal flap relatively higher and narrower, appearing subconical, with bluntly angular apex skewed towards proximal portion, gradually tapered distally, abruptly (almost perpendicularly) tapered proximally............................. F. mulayit sp. nov. – Carapace epibranchial tooth relatively sharp, triangular. G1 terminal segment not appearing twisted longitudinally, dorsal flap relatively lower and broader, appearing rectangular, with broadly convex apex in median portion, abruptly tapered (almost perpendicularly) distally and proximally........................................... F. kuehnelti ( Pretzmann, 1963 )