The amphipod symbiont of sea anemones originally described as Allogaussia recondita Stasek, 1958 is revised and allocated to the genus Orchomenella Sars, 1891 (sensu De Broyer, 1984, 1985). Preliminary data on the biology of the species are presented. The morphological adaptations toward a symbiontic life style are discussed and the unique variability and allometric growth of the telson is confirmed.