leucobacter aridicollis leucobacter aridicollis leucobacter aridicollis is a bacterium that was first isolated from a chromium-contaminated environment. leucobacter aridicollis scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: micrococcales family: microbacteriaceae genus: leucobacter species: l. aridicollis binomial name leucobacter aridicollismorais et al. 2005 type strain l-9t