Cyclopyxis aplanata var. microstoma Schönborn, 1966
Diagnosis: Shell circular with only slight arching, yellow-brown. Test coarsely granulated with isolated mineral and organic xenosomes. Pseudostome relatively narrow, circular and centrally located, with invagination.
Dimensions: Diameter 125.0-126.4 µm; height 40.8-41.4 µm; pseudostome diameter 26.4-26.5 µm.
Ecology: Freshwater, Lake Latnjajaure, Sweden.
Yogsothoth carteri, after Shishkin and Zlatogursky, 2018 Yogsothoth carteri Shishkin and Zlatogursky, 2018 Diagnosis: Individual cells in a colony have a diameter of 9.7-15.2 µm;
Yogsothoth knorrus, after Shishkin and Zlatogursky, 2018 Yogsothoth knorrus Shishkin and Zlatogursky, 2018 Diagnosis: Individual cells in colony have a diameter of 5.53-13.26 µm; they
Yogsothoth carteri, from Shishkin and Zlatogursky, 2018 Yogsothothidae Shishkin and Zlatogursky, 2018 Diagnosis: Centrohelids covered with two types of tangentially-oriented plate-scales, having a different morphology.
A. dürrschmidtidae – after Wujek, 2003 Acanthocystis dürrschmidtidae Wujek, 2003 Diagnosis: Cells 35-40 µm (based on a whole mount). Periplast comprising scales of two types, plate
Centroplasthelida Febvre-Chevalier and Febvre, 1984 Diagnosis: Phagotrophic and non-photosynthetic protists with one large spherical or near spherical centrosome at the center of the cell
Pterocystida Cavalier-Smith and Heyden, 2007 stat. n. Phylogenetic diagnosis: The least inclusive clade, containing Pterocystis devonica, Raphidiophrys heterophryoidea and Choanocystis curvata, but not Acanthocystis