A new species, Phytoseius feresi Demite & Cavalcante sp. nov. (Acari: Mesostigmata: Phytoseiidae) is described and illustrated based on adult females and males. It was found in association with plants in natural vegetation in Itacoatiara and Silves, Amazonas state, Brazil. This new species is a member of the purseglovei species group and differs from all other species of this group by possessing all dorsal setae, except Z5, and the ventral seta JV5 smooth. We propose a redefinition of the purseglovei species group in order to include the new species. In addition, a key to world species of the purseglovei species group is provided.