The external characters specific for male appeared
first in the postlarvae having carapace length ranged
0.6–0.7cm (approximately day 45th of the postlarval
stage); the male postlarvae developed the gonopore
complexes (Fig. 1B) at the opening of the vas deferens
(Fig. 1C) at the base of each fifth walking leg. All of the
specimens (with and without the gonopore complexes)
showed undifferentiated gonads.