Table 1. Microbial phyla detected among sequenced clones.

	Phylum	Representation, no. of clones
1	Proteobacteria
	Alpha	31
	Beta	1
	Gamma	139
	Delta	65
	Epsilon	11
	Unclear affiliation	26
2	Bacteriodetes	133
3	Chlorobi	11
4	Fibrobacteres	2
5	Gemmatimonadetes	2
6	Planctomycetes	14
7	Verrucomicrobia	28
8	Acidobacteria	18
9	Cyanobacteria	26
10	Spirochaetes	2
11	Fusobacteria	1
12	Firmicutes	3
13	Actinobacteria	11
14	Chloroflexi	11
15	Aquificae	1
16	OP3	1
17	WS3	3
18	TM6	1
19	OD1	4
20	OP1	1
21	SR1	2
22	Unclear affiliation	8

Boldface type represents phyla with no cultivated representatives. Candidate phyla are from refs. 23 and 24. Group 22 consists of eight sequences of unclear affiliation, which form at least three novel clades unrelated to known or candidate phyla.