Table 1.

Microorganisms involved in the various phases of the AD process [4,6,13,25,41,55]

AD Phase	Microbial Domain	Microbial Genus	Examples of Identified Species
Hydrolysis and Fermentation	Bacteria	Acetivibrio, Aminobacterium, Aminomonas, Anaeromusa, Anaerosphaera Bacillus, Bacteroides, Bifidobacterium, Butyrivibrio Caldanaerobacter, Caldicellulosiruptor, Campylobacter, Cellulomonas, Clostridium Devosia Espiroquetas. Eubacterium Fervidobacterium, Fibrobacter, Fusobacterium Gelria, Gracilibacter Halocella Lactobacillus Paludibacter, Peptococcus, Peptoniphilus, Proteiniborus, Pseudomonas, Psychrobacter Ralstonia, Ruminoclostridium, Ruminococcus Selenomonas, Shewanella, Sporanaerobacter, Streptococcus, Streptomyces Thermanaerovibrio, Thermomonas, Thermomonospora, Thermotoga, Treponema, Trichococcus	Pseudomonas mendocina Bacillus halodurans Clostridium hastiforme Gracilibacter thermotolerans Thermomonas haemolytica
	Fungi	Aspergillus Humicola Penicillium Trichoderma	Trichoderma reesei
Acetogenesis	Bacteria	Acetobacterium Clostridium Desulfotignum Eubacterium Holophaga Moorella Ruminococcus Sporomusa Thermoanaerobacter, Treponema	Moorella thermoacetica Desulfotignum phosphitoxidans Holophaga foetida
Methanogenesis	Archaea	Methanobacterium, Methanobrevibacter, Methanococcus, Methanoculleus, Methanosaeta, Methanomicrobium, Methanosarcina, Methanospirillum, Methanothermobacter	Methanobrevibacter smithii Methanobrevibacter arboriphilus Methanococcus vannielii