Neoleptastacus trisetosus Sak et al. 2008

(4) trisetosus -group Diagnosis. Anal somite without paired dorsolateral processes. Anal operculum well developed, often produced into a rounded medial extension (not illustrated for N. trisetosa). P1 exp-1 without outer spine (exopod sometimes 2-segmented); exp-3 with three setae/spines. P1 enp-2 with outer spine and inner geniculate seta distally. P2 exp-2 with very long outer setiform element (extending far beyond distal margin of exp-3). Endopod P2–P3 1-segmented. P2 endopod with inner seta and one distal spine. P3 endopod with one distal spine. P4 enp-2 outer seta reduced. Species included. N. africanus (Chappuis & Rouch, 1961), N. trisetosus (Mielke, 1982a), N. angolensis (Bodiou & Colomines, 1986) comb. nov., N. panamensis sp. nov., N. supersetosus sp. nov. The common origin of the species included in this group is strongly supported by five apomorphic character states: (1) absence of outer spine on P1 exp-1, (2) presence of only three elements on the distal segment of P1 exopod, (3) 1-segmented P2–P3 endopods with reduced armature (110 and 010, respectively), (4) P2 exp-2 with very long outer setiform element, extending far beyond distal margin of exp-3, and (5) anal operculum well developed, often produced into a rounded median extension (unconfirmed for N. trisetosus and N. panamensis sp. nov.). Neoleptastacus africanus and N. angolensis comb. nov. share the plesiomorphic 3-segmented P1 exopod, a distinctly elongate P4 exopod and possibly reduced armature on the P5. Neoleptastacus trisetosus, N. panamensis sp. nov. and N. supersetosus sp. nov. exhibit the apomorphic 2-segmented condition of the P1 exopod. The group has a wide distribution with records from the Galápagos archipelago (Ecuador), Panama, Kuwait and the Atlantic seaboard of Africa.