Arctides, HOLTHUIS, 1960

Holthuis, Lipke B., 2006, Revision of the genus Arctides Holthuis, 1960 (Crustacea, Decapoda, Scyllaridae), Zoosystema 28 (2), pp. 417-433 : 418-419

KEY TO SPECIES OF THE GENUS ARCTIDES HOLTHUIS, 1960

1. Sculpturation of abdomen very distinct, naked parts elevated, separated by narrow hairy grooves. Median figures with broad lateral lobes. Naked area along posterior margin of somites II to V occupying almost half of the exposed length of the somites. Legs slender, propodus of second leg about five to six times as long as wide. Propodus, carpus and merus of second to fifth legs each with a coloured band. Smaller species, carapace length less than 70 mm ......................................................................................................... 2

— Sculpturation of abdomen less distinct, partly obscured by hairs and tubercles. Hairy grooves between naked portions wide. Median figures elongate and narrow, usually much elevated above surface of the somites. Naked area along posterior margin of somites II to V occupying about 1/3 of length of posterior half of somite. Legs more robust, propodus of second leg about three times as long as wide. No coloured bands on the legs. Dactylus and propodus of first and second legs purplish with small white spots. Larger species, carapace length up to more than 100 mm ............................................ A. antipodarum

2. Two double-topped spinules behind gastric spine of carapace. Denticles of outer margin of last antennal segment small. Atlantic ..................................................... A. guineensis

— A longitudinal row of three single spinules behind gastric spine. Denticles on outer margin of last antennal segment large. Indo-West Pacific region ................................. A. regalis