Valid publication of the names Caecibacterium and Caecibacterium sporoformans

Descriptions of the genus Caecibacterium and its proposed type species Caecibacterium sporoformans were published in the IJSEM by Onrust et al. (Int J Syst Evol Microbiol 2017;67:4589-4594). The type strain was deposited as LMG 27730 and DSM 26959. DSM 26959 is a patent strain, and therefore the names were effectively, but not validly, published based on Rule 30 (4) of the International Code of Nomenclature of Prokaryotes. The type strain of C. sporoformans is now available from the Deutsche Sammlung von Mikroorganismen und Zellkulturen as DSM 103070 and no restrictions have been placed on its distribution. We here present new descriptions of the genus and its type species so that the names can be validly published

Caecibacterium sporoformans gen. nov., sp nov., an anaerobic, butyrate-producing, spore-forming bacterium isolated from chicken caecum

Strains of a Gram-stain-negative, rod-shaped and immotile bacterium were isolated from broiler chicken caecal content. The isolates required strict anaerobic conditions for growth, formed spores, were catalase-positive and oxidase-negative. They produced butyrate as the major metabolic end product in reinforced clostridial medium broth. The genomic DNA G+C content of the isolated strains was 32.5-34.6 mol%. The major cellular fatty acids were C-16:0 (FAME), C-14:0 (FAME), C-19:0CYC (9,10DMA) and C-16:0DMA. The fatty acid composition of the cell wall showed no similarity to any strain in the MIDI database. 16S rRNA gene sequence analysis showed that the nearest phylogenetic neighbours were Anaerostipes hadrus and Clostridium populeti (92% sequence similarity) within Clostridium cluster XIVa of the phylum Firmicutes. Therefore, a novel genus is proposed, with the name Caecibacterium sporoformans gen. nov., sp. nov. The type strain of Caecibacterium sporoformans is LMG 27730(T) =DSM 26959(T)