allochromatium humboldtianum allochromatium humboldtianum allochromatium humboldtianum is a gram-negative and motile bacterium from the genus of allochromatium which has been isolated from shallow water and coastal sediments from the coast of callao in peru. allochromatium humboldtianum scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: chromatiales family: chromatiaceae genus: allochromatium species: a. humboldtianum binomial name allochromatium humboldtianumserrano et al. 2015 type strain dsm 21881, kctc 15448, ax1ype