arcicella rosea arcicella rosea arcicella rosea is a gram-negative bacterium from the genus of arcicella which has been isolated from tap water. arcicella rosea scientific classification domain: bacteria phylum: bacteroidota class: cytophagia order: cytophagales family: spirosomaceae genus: arcicella species: a. rosea binomial name arcicella roseakämpfer et al. 2009 type strain ccm 7523, ccug 55942, tw5 synonyms arcicella aquiviva