aquisphaera aquisphaera aquisphaera is a chemoheterotrophic genus of bacteria from the family of isosphaeraceae with one known species (aquisphaera giovannonii). aquisphaera giovannonii has been isolated from sediments from a freshwater aquarium from porto in portugal. aquisphaera scientific classification domain: bacteria phylum: planctomycetota class: planctomycetia order: isosphaerales family: isosphaeraceae genus: aquisphaerabondoso et al. 2011 type species aquisphaera giovannoniibondoso et al. 2011 species a. giovannonii