orenia metallireducens orenia metallireducens orenia metallireducens is a halophilic and metal-reducing bacterium from the genus of orenia which has been isolated from groundwater from the illinois basin. orenia metallireducens scientific classification domain: bacteria phylum: bacillota class: clostridia order: halanaerobiales family: halobacteroidaceae genus: orenia species: o. metallireducens binomial name orenia metallireducensdong et al. 2016 type strain z6