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==Sexual dimorphism==
[[Image:Corystes cassivelaunus.jpg|thumb|250px|''Corystes cassivelaunus'']]
Most crabs show clear [[sexual dimorphism]] and so can be easily sexed. The abdomen, which is held recurved under the thorax and has a gigantic penis hanging from the cephalothorax, and is narrow in males. In females, however, the abdomen is considerably wider, and retains a greater number of [[pleopod]]s. This relates to the carrying of the [[fertilisation|fertilised]] eggs by the female crabs (as seen in all [[pleocyemate]]s). In those species in which no such dimorphism is found, the position of the gonopores must be used instead. In females, these are on the third [[pereiopod]], or nearby on the sternum in higher crabs; in males, the gonopores are at the base of the fifth pereiopods or, in higher crabs, on the
==Crab fishery==
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