Hittade det här (och massa mer) *läser så ögonen blir blå* "Hermits have separate sexes with relatively little sexual dimorphism. The best I can offer is that, in general, the males tend to be larger than the females and in some species the chelipeds (claws) are larger on the males. Hermits often have elaborate mating behaviors (displays, shell knocking and such) during which the male will guard the female until she releases the prior brood that she is carrying. Thus, in the aquarium, when people see this, they report a larger hermit "messing" with a smaller one, and suddenly the smaller one sprays out a stream of larvae. Once the brood is released, the female typically molts prior to copulation (which is why the male guards her) and extruding their next brood. During copulation, the male attaches dozens to hundreds of spermatophores (packets of sperm) to the "abdomen" of the female, and eggs are fertilized as the female releases them prior to attachment to the "abdomen." The male then moves on (this "courting" period can take anywhere from several hours to a week or more in some species), and the female then carries a colorful brood of fertilized eggs on her "abdomen" (or more correctly on the pleopods) within the shell for anywhere from several weeks to a year or so, during which time she constantly cleans and ventilates the developing young."