Table 1 Genomic features of the B. septemdierum symbiont, the related thioautotrophic symbionts and free-living bacteria

Symbol	BSEPE	eofBa	SUP05OMZ	SUP05GB1	SUP05GB2	Rma	Vok	eofSc
Organism	Endosymbiont of Bathymodiolus septemdierum str. Myojin knoll	Endosymbiont of Bathymodiolus sp.	Saanich Inlet OMZ SUP05	Guaymas Basin SUP05 GB-1	Guaymas Basin SUP05 GB-2	Candidatus Ruthia magnifica str. Cm	Candidatus Vesicomyosocius okutanii HA	Scaly-foot gastropod endosymbiont
Host	Bathymodiolus septemdierum	Bathymodiolus sp.	Free-living	Free-living	Free-living	Calyptogena magnifica	Calyptogena okutanii	Scaly foot gastropod
Accession number	AP013042	CAEB00000000	GG729945-GG729951, GG729953-GG729965, GG729967-GG730040	AJXC01000000^a	AJXC01000000^a	CP000488	AP009247	AP012978
Genome size	1 469 434	>619 851	>1 164 035	>1 246 425	>1 238 377	1 160 782	1 022 154	2 597 759
GC content	0.387	0.384	0.393	0.395	0.387	0.340	0.316	0.651
State	Complete	Draft	Draft	Draft	Draft	Complete	Complete	Complete
Contigs	1	78	90	100	120	1	1	1
Ave. redundancy	40	14.5	7.25	13.07	12.59	—	—	65
Protein coding sequences	1471	636	1282	1535	1568	976	937	2249
Pseudogene	52	—	23	—	—	100	3	152
rRNA operon	1	—	1	1	1	1	1	1
tRNA genes	35	11	29	34	34	36	35	40
Coverage of genes	0.924	0.889	0.878	0.933	0.929	0.799	0.852	0.826
Orthologs^b	—	509	948	1066	1055	901	877	1013
Maximun likelihood distance (Mode)	—	0.18	0.144	0.162	0.14	0.404	0.398	0.707
Reference	—	Petersen et al. (2011)	Walsh et al. (2009)	Anantharaman et al. (2013)	Anantharaman et al. (2013)	Newton et al. (2007)	Kuwahara et al. (2007)	Nakagawa et al. (2014)

^aAccession numbers of individual genomic contigs are shown in the Supplementary Methods section.
^bNumber of orthologs between BSEPE and the reference genome.

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