Paraptychostomum Ngassam, de Puytorac & Grain 1994
Ngassam, de Puytorac & Grain 1994. On Paraptychostomum almae n. g., n. sp., a commensal ciliate from the digestive tract of oligochaetes of the Cameroons, in a new subclass Hysterocinetia. Journal of Eukaryotic Microbiology, 41(2), March-April 1994: 155-162