Table 1. Classification and general features of Candidatus Ruthia magnifica according to the MIGS recommendations.

MIGS ID	Property	Term	Evidence codea
MIGS-2	Current classification	Domain Bacteria    Phylum Proteobacteria    Class Gammaproteobacteria    Gammaproteobacteria unclassified    sulfur-oxidizing symbionts    Candidatus Ruthia magnifica	TAS[9]
	Gram stain	negative	NAS
	Cell shape	coccus	TAS[4,5]
	Motility	none	TAS[4,5]
	Sporulation	nonsporulating	NAS
	Temperature range	mesophile	NAS
	Optimum temperature	unknown
	Carbon source	CO2	TAS[6]
	Energy source	H2S (Chemoautotroph)	TAS[6]
	Terminal electron receptor	O2	TAS[6]
MIGS-6	Habitat	endosymbiont, marine, host,    hydrothermal vents	TAS[3,4,5]
MIGS-6.3	Salinity	~34.6 pps	NAS
MIGS-22	Oxygen	aerobic	TAS [4,9]
MIGS-15	Biotic relationship	symbiotic	TAS [4,9]
MIGS-14	Pathogenicity	none	NAS
MIGS-4	Geographic location	9-North, East Pacific Rise,    Hydrothermal vents
MIGS-5	Sample collection time	December 2004	TAS [9]
MIGS-4.1 MIGS-4.2	Latitude   Longitude	9° 51’ N    104° 18’ W	NAS
MIGS-4.3	Depth	~2500 m	NAS

a) Evidence codes - IDA: Inferred from Direct Assay; TAS: Traceable Author Statement (i.e., a direct report exists in the literature); NAS: Non-traceable Author Statement (i.e., not directly observed for the living, isolated sample, but based on a generally accepted property for the species, or anecdotal evidence). These evidence codes are from the Gene Ontology project [13].