Halteria grandinella (Müller, 1773) Dujardin, 1841: Ovoid, 30 μm long; somatic cirri (bristles) grouped into 7 sets of 3 (Carey, 1992). 25-50 μm long; round or broadly oval body, with consipicuous flattened adoral zone surrounded by long membranelles; 7 groups of 3 cirri each in an equatorial ring around the body (How to know the protozoa, 1979).