vorticella citrina vorticella citrina vorticella convallaria is a species of ciliates. it forms part of the v. convallaria species complex. v. citrina is lemon yellow to light green in colour. vorticella citrina scientific classification domain: eukaryota clade: diaphoretickes clade: sar clade: alveolata phylum: ciliophora class: oligohymenophorea order: sessilida family: vorticellidae genus: vorticella species: v. citrina binomial name vorticella citrinamull., 1786