Flabellula citata Schaeffer, 1926
Diagnosis: Length in locomotion 15-75 µm; width 25-55 µm. Shape very variable, from a broad fan-shape to a spatula-shape, with the broad end advancing. Pseudopods numerous, of many shapes and sizes, determinate, not directing locomotion. No eruptive waves of endoplasm during locomotion. Anterior third of clear protoplasm, with an occasional ridge. Endoplasm in posterior region granular, and set off definitely from the clear endoplasm by a sharp line. Nucleus single, not conspicuous. Chromatin mass spherical, homogeneous, surrounded by a nuclear membrane. Diameter of chromatin mass 2 µm; of membrane 5 µm. Uroid of few to many elements always present. Food, bacterial. Food vacuoles, from 1 to 12 or more, frequently present.
Ecology: Marine. Tortugas, Florida; Cold Spring Harbor, Long Island; Casco Bay, Maine, all USA.