phycisphaerae phycisphaerae phycisphaerae is a class of aquatic bacteria. they reproduce by budding and are found in samples of algae in marine water. organisms in this group are spherical and have a holdfast, at the tip of a thin cylindrical extension from the cell body called the stalk, at the nonreproductive end that helps them to attach to each other during budding. phycisphaerae scientific classification domain: bacteria phylum: planctomycetota class: phycisphaeraefukunaga et al. 2010 orders phycisphaerales sedimentisphaerales tepidisphaerales synonyms "phycisphaeria" oren, parte & garrity 2016 phylogeny phylogeny based on gtdb 07-rs207 by genome taxonomy database sedimentisphaerales anaerohalosphaeraceae sedimentisphaeraceae tepidisphaerales tepidisphaeraceae phycisphaerales phycisphaeraceae