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A gamma- and UV-radiation-tolerant, pale-pink strain (TDMA-uv53(T)) was isolated from a freshwater sample collected at Misasa (Tottori, Japan), after exposure of the water sample to UV radiation. The cells stained Gram-positive and were non-motile, rod-shaped and non-spore-forming. The DNA G + C content of the strain was 69.1 mol%. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain TDMA-uv53(T) belongs to the genus Deinococcus, the highest sequence similarities being found with Deinococcus claudionis PO-04-19-125(T) (96%), D. altitudinis ME-04-01-32(T) (96 %), D. radiomollis PO-04-20-132(T) (95%), D. deserti VCD115(T) (91.5 %), D. hopiensis KR-140(T) (91.0 %) and D. sonorensis KR-87(T) (91.0%). Major fatty acids were iso-15:0, 15:1 omega 6c, 15:0, 16:0 and summed feature 3 (iso-15: 0 2-OH and/or 16:1 omega 7c). MK-8 was the predominant respiratory quinone. Phylogenetic distinctiveness and unique phenotypic characteristics differentiated strain TDMA-uv53(T) from closely related Deinococcus species. The results of our polyphasic taxonomic analyses suggested that TDMA-uv53(T) represents a novel Deinococcus species, for which the name Deinococcus aquiradiocola sp. nov. is proposed. The type strain is TDMA-uv53(T) (=JCM 14370(T) =NBRC 102118(T) =CCUG 53612(T)).