Agonistic and Sexual Behavior of the Xanthid Crab, Neopanope sayi

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Abstract
The social behavior ofNeopanope sayi is more complicated than that usually reported for totally aquatic brachyurans. Ritualized visual displays, especially the Lateral Merus, are important in agonistic encounters. Fights are rare. During sexual interactions stereotyped periodic movements immediately after the male grabs the female may be responsible for species, sexual, and mate discrimination. Behavior prior to the Grab resembles advanced agonistic encounters, which may explain why males almost always copulate with females smaller than themselves. Females mate while in the hard stages of the molt cycle and sometimes when ovigerous.

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