Abstract
ABSTRACT We studied the mating behavior and clarified the mating sequences of the hermit crab Pagurus filholi under laboratory conditions. The mating sequences differed, depending on the male to female size ratio. Before copulation, larger males relative to potential female mates tended to perform precopulatory guarding behavior, i.e., grasping the rim of the shell of the female with their chelipeds, more frequently than smaller males. On the other hand, smaller males relative to the females appeared to insert their chelipeds and to attempt copulation by pulling the female out of the shell without performing precopulatory mate-guarding behavior. These different behaviors may be conditional strategies that depend on the male/female size ratio.
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