Table 1. Classification and general features of S. caldaria H1^T according to the MIGS recommendations [25] and the NamesforLife database [4].

MIGS ID	Property	Term	Evidence code
	Current classification	Domain Bacteria	TAS [26]
		Phylum Spirochaetae	TAS [27,28]
		Class Spirochaetes	TAS [29,30]
		Order Spirochaetales	TAS [31,32]
		Family Spirochaetaceae	TAS [30,31,33]
		Genus Spirochaeta	TAS [31,34-36]
		Species Spirochaeta caldaria	TAS [1,2]
		Type strain H1	TAS [1,2]
	Gram stain	negative	TAS [2]
	Cell shape	spiral shaped	TAS [2]
	Motility	motile	TAS [2]
	Sporulation	none	TAS [2]
	Temperature range	thermophile	TAS [2]
	Optimum temperature	48-52°C	TAS [2]
	Salinity	<0.4%	TAS [2]
MIGS-22	Oxygen requirement	obligately anaerobic	TAS [2]
	Carbon source	carbohydrates	TAS [2]
	Energy metabolism	chemoorganotroph	TAS [2]
MIGS-6	Habitat	fresh water, hot spring	TAS [2]
MIGS-15	Biotic relationship	free living	TAS [2]
MIGS-14	Pathogenicity	none	TAS [2]
	Biosafety level	1	TAS [37]
	Isolation	hot spring	TAS [2]
MIGS-4	Geographic location	Hunter's Hot Spring, Oregon	TAS [2]
MIGS-5	Sample collection time	August 1990	NAS
MIGS-4.1	Latitude	42.222	NAS
MIGS-4.2	Longitude	-120.368	NAS
MIGS-4.3	Depth	not reported
MIGS-4.4	Altitude	not reported

Evidence codes - 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). Evidence codes are from of the Gene Ontology project [75].