Table 1.

Methanogens found in digestive tract microbiota of animals.

Methanogens Species Obtained by Culture

Additional Species Detected by PCR-Based Methods But Not by Culture

Methanosarcina sp. Methanobacterium formicicum Methanomicrobium mobile Methanosarcina barkeri Methanobacterium bryantii Methanobrevibacter, ruminantium Methanobrevibacter millerae Methanobrevibacter olleyae Methanoculleus olentangyi Methanobrevibacter woesei Methanobrevibacter gottschalkii Methanobrevibacter thaueri Methanobrevibacter wolinii Methanobrevibacter cuticularis Methanobrevibacter curvatus Methanobrevibacter filiformi

Methanobrevibacter smithii Methanimicrococcus spp. Methanosphaera spp. Methanobacterium spp.