Field surveys in northern Florida, the Florida Keys, and Jamaica revealed several patterns of intra- and inter-specific interactions among the common brachyuran crabs found under rocks and anemones. Panopeus herbstii and Menippe mercenaria did not co-occur under the same
rock and the males of P. herbstii found with females were larger than males without females. Mithrax sculptus did not co-occur with Mithrax commensalis on anemones in Jamaica but the distributions of M. sculptus and Microphryus bicornutus under rocks in the
Florida Keys were independent. For both species in the Keys, males with females were not larger than males without females.
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