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Sexual Dimorphism

Males often larger than females because females grow more slowly after maturity, but the reverse also occurs; dwarf males common in parasitic isopods (Bopyrus) and some species (e.g. Jaera) have both small and large males; male appendages often specialized for detecting pheromones, sexual signals, sperm transport or grasping females. Female appendages often modified for holding eggs. Color differences are common in crabs, shrimp and stomatopods.


Creative Commons — CC0 1.0 Universal

Source: Fairbairn, 2013

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