A new halophilic chemoorganotrophic bacterium (strain H150 [T = type strain]) related to was isolated from the hypersaline sediments of Retba Lake in Senegal. This organism was a rod-shaped, motile, non-spore-forming, gram-negative obligate anaerobe that grew optimally in the presence of 10% NaCl and at 40°C. The DNA base composition was 31.7 ± 0.3 mol% guanine plus cytosine. The fermentation products from glucose were acetate, H, and CO. The fermentable substrates included cellobiose, fructose, glucose, maltose, lactose, glycerol, mannitol, mannose, ribose, raffinose, and sucrose. Penicillin G, cephalosporin C, novobiocin, vancomycin, and chloramphenicol inhibited growth. As determined by DNA-DNA hybridization, strain H150 was 71% related to , with Δ value of 6.0°C. However, strain H150 exhibited marked phenotypic differences, particularly in the range of substrates used, when it was compared with the type species of the genus . For this isolate we propose the name subsp. subsp. nov.; strain H150 (= DSM 7379) is the type strain of this taxon.


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