bacillus pseudofirmus bacillus pseudofirmus bacillus pseudofirmus is a facultative anaerobe bacterium. it is a gram positive, alkaliphilic and alkalitolerant, aerobic endospore-forming bacteria. bacillus pseudofirmus scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: bacillaceae genus: bacillus species: b. pseudofirmus binomial name bacillus pseudofirmusnielsen et al. 1995 in 2019, it was found in a hyperalkaline spring in zambales (philippines) a bacterial consortium of a strain of bacillus pseudofirmus with bacillus agaradhaerens that can biodegrade ldpe plastic. this species has been recently transferred into the genus alkalihalobacillus. the correct nomenclature is alkalihalobacillus pseudofirmus.