Fig. S1. Maximum-likelihood phylogenetic tree built from a concatenated alignment of 50 ribosomal proteins (6164 unambiguously aligned positions).

Fig. S2. Maximum-likelihood phylogenetic tree for RpoB (1154 unambiguously aligned positions).

Fig. S3. Maximum-likelihood phylogenetic tree for GyrB 631 unambiguously aligned positions).


Table S1. Genome sequencing of the Gram-negative members of the Firmicutes (original family Veillonellaceae).

Table S2. Presence of widespread sporulation genes in the genomes of members of the original family Veillonellaceae.

Table S3. The NCBI gi and UniProt accession numbers for sporulation proteins from A. longum, P. fermentas and T. carboxydivorans (Excel format).

Table S4. Presence of bacilli-specific sporulation genes in the genomes of members of the original family Veillonellaceae.

Table S5. NCBI gi and UniProt accession numbers for the A. longum, P. fermentas and T. carboxydivorans orthologs of the sporulation proteins from C. difficile (Excel format).

Table S6. Genera of the Selenomonas-Megasphaera-Sporomusa branch (old family Veillonellaceae).

Table S7. Organisms with sequenced genomes that are misassigned to the genus Clostridium.

Table S8. A complete list of validly described Clostridium spp. that belong to the proposed new genera (both in PDF and Excel format).

Table S9. Organisms used for the construction of the tree shown in Fig. 1 and their GenBank entries.

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