Hyalodiscus rubicundus Hertwig & Lesser, 1874
Diagnosis: Cells discoid with breadth greater than length. Extensive, flattened hyaline margin surrounding the cytoplasmic hump anteriorly and laterally and sometimes posteriorly. Locomotion frequently rapid with a distinctive rolling motion. Fine, short subpseudopodia extend from the hyaloplasm. Floating form with radiate pseudopodia. Cytoplasmic mass usually reddish brown or greenish in color with 1 or 2 nuclei.
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