Reference

D. Ji, Weibo Song, John C Clamp (2006): Pseudovorticella zhengae n. sp., P. difficilis (Kahl, 1933) Jankowski, 1976, and P. punctata (Dons, 1918) Warren, 1987, three marine peritrichous ciliates from north China – Eur. J. Prot. – 42: 269 - 279.