Halosegnis

Abstract

Ha.lo.seg'nis. Gr. masc. n. hals, halos , salt; L. masc. adj. segnis , slow; N.L. masc. n. Halosegnis , a slow salt [growing] organism. Euryarchaeota / Halobacteria / Halobacteriales / Haloarculaceae / Halosegnis The genus Halosegnis is classified within the family Haloarculaceae , order Halobacteriales , and to the class Halobacteria . The cells are Gram‐stain‐negative, nonmotile rods, producing red‐ to light red‐pigmented colonies. Strictly aerobic. Extremely halophilic. Optimal growth at 20–25% (w/v) NaCl, at pH 7.5, and 37°C. Heterotrophic. Catalase‐positive but oxidase‐negative. The major polar lipids include biphosphatidylglycerol (BPG), phosphatidylglycerol (PG), phosphatidylglycerol phosphate methyl ester (PGP‐Me), phosphatidylglycerol sulfate (PGS), one glycolipid chromatographically identical to sulfated mannosyl glucosyl diether (S‐DGD‐1), sulfated triglycosyl diphytanyl archaeol ester linked to phosphatidic acid (S‐TGD‐1‐PA), and sulfated tetraglycosyl diether (S‐TeGD). Currently, the genus includes two species: Halosegnis rubeus (type species of the genus) and Halosegnis longus . Both species were isolated from marine salterns, but they are widely distributed in hypersaline aquatic habitats, especially at intermediate salinities. DNA G + C content (mol%): 64.7–66.0 (genome). Type species: Halosegnis rubeus Durán‐Viseras et al. 2021, VL203.