16S rRNA gene phylogeny of 24 Alcaligenes spp., including A. defragrans, A. xylosoxidans, and several substrains of A. faecalis. In addition, a related bacterium isolated from larvae guts, Paenalcaligenes sp. ABC02-12, was used as an outgroup (green line). Maximum likelihood method was used to compute the evolutionary distances and the neighbor-joining method was used to infer the evolutionary history. Bootstrap percentages are given in the nodes (number of bootstrap replicates: 1000). A. faecalis strain MOR_02 is shown in red.