Through an acclimation behavior, Periclimenes rathbunae Schmitt and Periclimenes anthophilus Holthuis and Eibl-Eibesfeldt acquire protection from the tentacles of their respective host sea anemones, Stoichactis helianthus (Ellis) and Condylactis gigantea
(Weinland). Laboratory experiments have shown that after a period of isolation from the host these shrimps lose their protection from nematocysts. Unacclimated (=unprotected) shrimps were stung by anemones with and without shrimps living with them, while acclimated (=protected) shrimps were
not stung by anemones, with or without shrimps.
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