Reference

Wilhelm Foissner, Helmut Berger (1999): Identification and ontogenesis of the nomen nudum hypotrichs (Protozoa: Ciliophora) *Oxytricha nova* (= *Sterkiella nova* sp. n.) and *O. trifallax* (= *S. histriomuscorum*) – Acta Protozool. – 38: 215 - 248.