FISH micrographs of TM7 (red) cells showing coccus morphology with a size of ~0.7 microns in diameter. - Source:1Fermentation
Based on their genome sequence, they have an obligate fermentative metabolism- fermenting glucose to lactate and acetate via the pentose phosphate pathway. Annotation of polysaccharases indicates an ability to utilise complex sugars 1.
 Albertsen, Hugenholtz, Skarshewski, Nielsen, Tyson, Nielsen, et al. (2013): Genome sequences of rare, uncultured bacteria obtained by differential coverage binning of multiple metagenomes. Nat. Biotechnol. 31 (6): 533-8. doi:10.1038/nbt.2579