Choanocystis bicornioides  Mikrjukov, 1995
  
Diagnosis: Cells are 18–20 µm in diameter with plate-scales and one type of  spicules in the periplast. Spicules are bilaterally symmetrical with a straight shaft about 2.2 µm long and a broadly bifurcated apex; furcae branch dichotomously. Plate-scales are oval, patternless, with a faintly developed medial constriction.

Habitat: Brackish water. Black Sea.