Reclassification of Anaerobaculum mobile, Anaerobaculum thermoterrenum, Anaerobaculum hydrogeniformans as Acetomicrobium mobile comb. nov., Acetomicrobium thermoterrenum comb. nov and Acetomicrobium hydrogeniformans comb. nov., respectively, and emendation of the genus Acetomicrobium
Résumé
Taking into account their 16S rRNA gene sequences, it appears that Acetomicrobium flavidum and the three Anaerobaculum species described so far belong to the same phylogenetic clade with high levels (>95 %) of similarity. In this respect, these three Anaerobaculum species should be reclassified within the genus Acetomicrobium which has priority over the genus Anaerobaculum since being validated later after the genus Acetomicrobium. The DNA G+C content of A. flavidum is 47.1 mol %, which is in the same order as that of the three Anaerobaculum species. All these bacteria have in common iso-C15:0 as their main fatty acid. Based on further phylogenetic, genetic, and chemotaxonomic studies, we propose Anaerobaculum mobile (= DSM 13181T = JCM 12221T), Anaerobaculum thermoterrenum (=DSM 13490T = ACM 5076T) and Anaerobaculum hydrogeniformans (= DSM 22491T =ATCC BAA-1850T) to be reclassified as Acetomicrobium mobile comb. nov., Acetomicrobium thermoterrenum comb. nov. and Acetomicrobium hydrogeniformans comb. nov., respectively. The four bacterial species belong to the phylum Synergistetes.