Revision of the family Spironemidae Doflein (Protista, Hemimastigophora), with description of two new species, Spironema terricola n. sp. and Stereonema geiseri n. g., n. sp. Journal of Eukaryotic Microbiology, 40(4), July-August 1993: 422-438. 424 [Zoological Record Volume 130]