Reference

Andreas Rodolfo Leitner, Wilhelm Foissner (1997): Morphology and infraciliature of *Microthorax pusillus* #Engelmann# 1862 and *Spathidium deforme* #Kahl# 1928, two ciliates (Protozoa, Ciliophora) from activated sludge – Linzer biol. Beitr. – 29/1: 349 - 368.