1. On the occurrence among the Infusoria of peculiar organs resembling thread cells;Allmann;Quart. J. Micr. Sci,1855
2. Antipa , G 1966 Observations on the fine structure of Didinium nasutum M. A. thesis San Francisco State College 78
3. Observations sur le Didinium nasutum (Stein);Balbiani;Arch. Zool. Exp. Gén,1873
4. Nigrosin-mercuric chloride-formalin: a stain fixative for ciliates;Borror;Stain Tech,1968
5. Protozoa, in Bronn, H., ed.;Bütschli;Klassen und Ordnungen des Tiers-Reichs,1889