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. - 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