Elamenopsis A. Milne Edwards, 1873

Naruse, Tohru & Ng, Peter K. L., 2007, On A New Species Of Elamenopsis From Singapore, With Notes On Crustaenia Palawanensis (Serène, 1971) (Crustacea: Decapoda: Brachyura: Hymenosomatidae), Raffles Bulletin of Zoology 55 (1), pp. 121-125 : 122

Key to the species of Elamenopsis A. Milne Edwards, 1873

1. Dorsal rim of carapace subrectangular, width to length ratio more than 1.36; anterior lateral margin without tooth or angle .... 2

– Dorsal rim of carapace subcircular, width to length ratio 1.19– 1.20; anterior lateral margin with 2 teeth or one angle ....... 3

2. Rostrum slightly bilobed to subtruncate in dorsal view, appears broadly triangular shape in frontal view; merus of third maxilliped as long as ischium; male fourth and fifth abdominal segments completely fused; G1 slender, distal parts gently tapering from stouter proximal part .......................................... ....................... Elamenopsis lineata A. Milne Edwards, 1873

– Rostrum distinctly triangular in dorsal view, appears relatively narrow between eyes in frontal view; merus of third maxilliped distinctly longer than ischium; all male abdominal segments freely articulating; G1 stout, distal part distinctly stouter than more slender proximal part ....................................................... ............................. Elamenopsis comosa Ng & Chuang, 1996

3. Anterolateral margin with 2 teeth, former tooth directed perpendicularly upwards; lateral lobes of rostrum distinct, similar to former anterolateral tooth; first to third ambulatory legs stout .................................... Elamenopsis ariakensis ( Sakai, 1969)

– Anterolateral margin with 1 angle which is formed by thickened rim with anterior notch; lateral lobes of rostrum present but very low; first to third ambulatory legs slender ............................... ......................................... Elamenopsis rotunda , new species