Legionellaceae Legionella Coxiellaceae Aquicella Coxiella Diplorickettsia Rickettsiella "Ca.

Pokemonas"[1] The Legionellales are an order of Pseudomonadota ("Proteobacteria").

[2] They comprise two families, typified by Legionella and Coxiella, both of which include notable pathogens.

For example, Q fever is caused by Coxiella burnetii and Legionella pneumophila causes Legionnaires' disease[3][4] and Pontiac fever.

[5][6][7] Members of the order Legionellales can be molecularly distinguished from other Gammaproteobacteria by the presence of four conserved signature indels (CSIs) in the proteins tRNA-guanine(34) transglycosylase, lipoprotein-releasing system transmembrane protein lolE and tRNA (guanosine(37)-N1)-methyltransferase TrmD.