Reference

Ngassam, Jean Grain (1997): Six new species of Hysterocinetidase belonging to two new genera *Metaptychostomum* and *Proptychostomum*, endocommensal ciliates of an oligochaete worm in Cameroons – Annls Sci. nat. (Zool. Biol. Anim.) – 18: 41 - 49.