Flabellamon, Ng, 1996

Tan, Zhi Wan & Yeo, Darren C. J., 2024, On the genus Flabellamon Ng, 1996, with descriptions of two new species (Crustacea: Brachyura: Potamidae), Zootaxa 5476 (1), pp. 434-446 : 444-445

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)