Heterophrys marina Hertwig et Lesser, 1874, emend. Mikrjukov, 1996
Diagnosis: Cells 9-45 µm in diameter, surrounded by a mucous coat of various width. Radial spicules are of uniform width, tapering abruptly towards sharp apices; their length is ca. the cell diameter. Some members possess algal symbionts.
Ecology: Marine and fresh water.