Rathbunaja Ng & Forges 2015, n. gen.

Key to species of Rathbunaja n. gen.

1. Pseudorostral spines short, weakly diverging, almost subparallel (Figs. 59F, 62A); ambulatory legs (notably merus and propodus) short (Figs. 59F, 62D–G); Papua New Guinea............................................................................... Rathbunaja brevipes n. sp.

– Pseudorostral spines long, diverging; ambulatory legs (notably merus and propodus) relatively longer...................................2

2. Carapace relatively broad (Fig. 60); distal spines on basal antennal article relatively longer, more strongly diverging (Fig. 61G); ischium of third maxilliped proportionately longer (Fig. 63E–H); male telson proportionately broader, appears semicircular (Fig. 64E); G1 very long, strongly curved, more slender, tip bent inwards (Fig. 67A–D); Philippines........................................................................... Rathbunaja ursus n. sp.

– Carapace relatively narrower (Fig. 59A–E); distal spines on basal antennal article relatively shorter, less diverging (Fig. 61A, C, E); ischium of third maxilliped proportionately shorter (Figs. 62C, 63A–D); male telson more triangular in shape (Fig. 64A–C); G1 gently curved, not elongate, tip straight (Figs. 66)............................................................................................3

3. Ambulatory merus relatively longer, more slender (Figs. 59C, E, 65F); G1 relatively more strongly curved, distal part relatively longer (Fig. 66H–M); Japan............................................................................................ Rathbunaja kiiensis (T. Sakai, 1969)

– Ambulatory merus relatively shorter, stouter (Figs. 59A, B, 65B, D); G1 gently curved, distal part relatively shorter (Fig. 66A–G); Philippines.. Rathbunaja bisarmata (Rathbun, 1916)