In the symbiotic association that exists between cleaner shrimp Ancylomenes pedersoni (=Periclimenes pedersoni) and host sea anemones, specificity varies among populations, and shrimp are believed to search among different individual hosts for favourable

The anemone shrimp Periclimenes pedersoni Chace, 1958 occurs in south Florida and throughout the West Indies. Periclimenes anthophilus Holthuis and Eibl-Eibesfeldt, 1964 closely resembles P. pedersoni but is believed to be endemic to Bermuda. Morphological