Like other brachyuran crabs, sex can be determined in Libinia dubia by examining the abdomen. In females, it is broader and can be tightly flexed to hold the egg mass, or sponge (eg. Ruppert et al. 2004). On average, females are also slightly smaller than males (O'Brien et al. 1999, Tunberg & Reed 2004). As with most decapod crustaceans, fertilization occurs during copulation. The male transfers sperm-filled cases, called spermatophores, to the female. After the eggs are fertilized, the female broods them on her abdomen until hatching.
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