The phylum Elusimicrobia previously known as 'Termite Group 1' has been shown to be widespread in different ecosystems like marine environment, sewage sludge, contaminated sites and soils. The high abundance of 'Elusimicrobia' representatives is only evidenced for the lineage of symbionts found in termites.
^Herlemann, D.P.R., Geissinger, O., Brune, A. (2007). "The Termite Group I phylum is highly diverse and widespread in the environment.". Appl. Environ. Microbiol.73 (20): 6682–6685. doi:10.1128/AEM.00712-07. PMC2075069. PMID17704269.