Genus Clydonella Sawyer, 1975
Diagnosis: Characters of the genus are intermediate between Vannella and Platyamoeba. Locomotive form with anterior hyaline region occupying 2/3 of the cell length. Hyaloplasm with faint lateral folds as ripples over anterior region. Locomotive form ovoid, usually 10 to 40 µm. No posterior uroid. Floating form with radiate, sometimes irregularly twisted pseudopodia; in some, radiating pseudopodia bent or extended in multiples of 2. Nucleus distinct with central nucleolus. Cytoplasm containing few vesicles. No cytoplasmic crystals or cysts. Fine structure of cell coat unknown.
Ecology: All 4 species marine.