This paper describes a new species in the genus Parametopella (Amphipoda: Stenothoidae), P. antholobae sp. nov., collected among the tentacles of the sea anemone Antholoba achates, found in shallow water near Coquimbo, Chile. A key to all Parametopella species is provided. The type specimen of the superficially similar species Parametopa alaskensis (Holmes) was studied; that species remains in Parametopa.