HPTLC stained with 5% (v/v) sulfuric acid showing the polar lipid profiles for Halorubrum strains belonging to group 1 and related taxa (A), to group 2 and related taxa (B), and to group 3 and related taxa (C). Hbt. salin, Halobacterium salinarum DSM 3754T; Hrr. sacch, Halorubrum saccharovorum DSM 1137T; Hrr. chaov, Halorubrum chaoviator Halo-G*T; Hrr. ezze, Halorubrum ezzemoulense DSM 17463T; Hrr. tibet, Halorubrum tibetense JCM 11889T; Ncc. amy, Natronococcus amylolyticus DSM 10524T; Hrr. kocurii, Halorubrum kocurii CECT 7322T; Hrr. cibi, Halorubrum cibi JCM 15757T. BPG, biphosphatidylglycerol; PG, phosphatidylglycerol; PGP-Me, phosphatidylglycerolphosphate methyl ester; PGS, phosphatidylglycerolsulfate; GL, unidentified glycolipid; S-DGD, sulfated mannosyl glucosyl diether; S-TGD-1-PA, sulfated galactosyl mannosy glucosyl dietherphosphatidic acid; S-TeGD, sulfated tetraglycosyl diether.