Acidiphilium is a genus in the phylum Proteobacteria (Bacteria). The name Acidiphiliumm derives from:New Latin noun acidum (from Latin adjective acidus, sour), an acid; New Latin neuter gender adjective philum (from Greek neuter gender adjective philon (φίλον)), friend, loving; New Latin neuter gender noun Acidiphilium (sic), acid lover. The genus contains 6 species (including basonyms and synonyms), namely Acidocella aminolytica and Acidocella facilis used to be in this genus.