Members of this subphylum are characterized by postciliodesmata (singular: postciliodesma), stacks of postciliary microtubular ribbons associated with the somatic kinetosomes.[3]
^Gerassimova, Z. P.; Seravin, L. N. (1976). "Ectoplasmic fibrillar system of Infusoria and its role for the understanding of their phylogeny". Zool. Zh. 55: 645–656.
^Corliss, John O. (1979). The Ciliated Protozoa: Characterization, Classification and Guide to the Literature. Pergamon Press. p. 198. ISBN9781483154176.