acidothermus acidothermus acidothermus cellulolyticus is a species of gram-variable bacteria. it is the only member of the genus acidothermus and the family acidothermaceae. acidothermus scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: acidothermalessen et al. 2014 family: acidothermaceaerainey et al. 1997 genus: acidothermusmohagheghi et al. 1986 species: a. cellulolyticus binomial name acidothermus cellulolyticusmohagheghi et al. 1986 history a. cellulolyticus was first isolated from acidic hot springs at yellowstone national park in 1987. etymology the name acidothermus derives from:latin adjective acidus, sour, acid; greek adjective thermos (θερμός), hot; neo-latin masculine gender noun acidothermus, acid and hot (loving). the specific epithet cellulolyticus derives from neo-latin noun cellulosum, cellulose; neo-latin masculine gender adjective lyticus (from greek masculine gender adjective lutikos (λυτικός)), able to loose, able to dissolve; neo-latin masculine gender adjective cellulolyticus, cellulose-dissolving.)