arcicella rigui arcicella rigui arcicella rigui is a gram-negative, strictly aerobic, vibrioid, polymorphic and non-motile bacterium from the genus of arcicella which has been isolated from water from the niao-song wetland park in taiwan. arcicella rigui scientific classification domain: bacteria phylum: bacteroidota class: cytophagia order: cytophagales family: spirosomaceae genus: arcicella species: a. rigui binomial name arcicella riguichen et al. 2013 type strain bcrc 80260, kctc 23307, nsw-5