Coxiellaceae
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The Coxiellaceae are a family in the order Legionellales.<ref>Template:MeshName</ref><ref name="pmid18398164">Template:Cite journal</ref>
Coxiella burnetii is the best-described species in this group.
The bacterium Rickettsiella melolonthae was initially assigned to the Coxiellaceae,<ref name="pmid18398164" /> but is considered part of the Diplorickettsiaceae (a closely related lineage of Gammaproteobacteria) based on recent phylogenomic reconstructions.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>Template:Cite journal</ref>
Various other Coxiellaceae lineages have so-far evaded cultivation efforts but have been characterized through culture-independent genomics and are present in both freshwater and diverse marine environments, likely with a host-associated lifestyle similar to that of Coxiella burnetti<ref>Template:Cite journal</ref>.