The genus is phenotypically and genotypically diverse, with many species phylogenetically located outside . One such group consists of the species and (formally clostridial rRNA cluster XVIII) 1. Sequencing of the 16S rRNA and, more recently, the results of genomic analyses have demonstrated that these species represent a coherent cluster separated from other closely related genera located in the family within the order 2. In addition to phenotypic, phylogenetic and genomic comparisons, chemotaxonomic features were consistent between all four species, the predominant fatty acids were C and C ω9 , while glucose and ribose were the whole cell sugars present in the cell walls. Furthermore, he results of peptidoglycan analysis indicated that -2,6-diaminopimelic acid was present as the diagnostic diamino acid in all four species. Biochemical profiles were also concordant with them being closely related species. Therefore, on the basis of phylogenetic, genomic, phenotypic and chemotaxonomic information, a novel genus, gen. nov., is proposed. It is suggested that and be transferred to this genus as comb. nov., comb. nov., comb. nov. and comb. nov. The type species of the genus is CCUG 24038 (=ATCC 25582 =DSM 1402 ).