Reference

Monika Bauer-Nebelsick, Christian F. Bardele, J.A. Ott (1996): Redescription of *Zoothamnium niveum* (#Hemprich & Ehrenberg, 1831) Ehrenberg#, 1838 (Oligohymenophora, Peritrichida), a ciliate with ectosymbiotic, chemoautotrophic bacteria – Europ. J. Protistol. – 32: 18 - 30.