Erimetopus, Rathbun, 1894

Cumberlidge, Neil & Reed, Sadie K., 2004, Erimetopus vandenbrandeni (Balss, 1936) n. comb., with notes on the taxonomy of the genus Erimetopus Rathbun, 1894 (Brachyura: Potamoidea: Potamonautidae) from Central Africa, Zootaxa 422 (1), pp. 1-27 : 6-7

Key to the species of Erimetopus

1 Frontal margin deeply indented in center forming two rounded frontal lobes; eyestalk short, tapering; cornea reduced, pigment dorsal only; margins of meri of P2–P5 either smooth or with sparse hair­like setae; second carpal tooth of P1 large (subequal to first carpal tooth); carapace medium height (ch/fw 1.4); carapace height greater than front width; anterolateral margin of carapace behind exorbital tooth lacking sinus, curving evenly to meet epibranchial tooth ...................... E. brazzae (A Milne­Edwards, 1886)

– Frontal margin either straight or only faintly indented in center; eyestalk normal length, not tapering distally; cornea not reduced, pigment dorsal and ventral; margins of meri of P2–P5 lined by dense hair­like setae; second carpal tooth of P1 reduced (much smaller than first carpal tooth); carapace very flat (ch/fw 0.9); carapace height less than front width; anterolateral margin of carapace behind exorbital tooth forming deep sinus before meeting epibranchial tooth .......................... E. vandenbrandeni n. comb.

1. Erimetopus brazzae (A Milne­Edwards, 1886) ( Figs. 1–17 , 42 )

Figures

FIGURES 1–11. Erimetopus brazzae (A. Milne­Edwards, 1886), adult female lectotype, cw 23.5 mm, MNHN­B5069. 1, carapace and eyes, dorsal view; 2, cephalothorax, carapace and eyes, frontal view; 3, carpus. propodus, and dactylus of right cheliped, frontal view; 4, carpus. propodus, and dactylus of left cheliped, frontal view; 5, carpus of cheliped, superior view; 6, merus of right cheliped, dorsal view; 7, merus of right cheliped, inferior view; 8, left third maxilliped; 9, abdomen; 10, right pereopod 3; 11, right pereopod 5. Scale = 5 mm (1–2, 5, 9–11); 10 mm (3, 6–8).

FIGURES 12–14. Erimetopus brazzae (A. Milne­Edwards, 1886), photographs of adult female lectotype of Thelphusa brazzae A. Milne­Edwards, 1886, cw 23.5 mm, MNHN­B5069. 12, frontal view; 13, dorsal view; 14, underside, ventral view.

FIGURES 15–17. Erimetopus brazzae (A. Milne­Edwards, 1886), photographs of adult female lectotype of Erimetopus spinosus Rathbun, 1894 cw 33.5 mm, USNM 18066. 15, frontal view; 16, dorsal view; 17, underside, ventral view.

FIGURES 42–44. Erimetopus vandenbrandeni n. comb. (Balss, 1936), photographs of subadult male lectotype (cw 16.5 mm), MRAC 1273. 42, first gonopod ventral view; 43, first gonopod dorsal view; 44, first gonopod terminal article, dorsal view.