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Note the fine filopodia which arise from the surface of the veil.

Genus Hyalodiscus 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 sometimes reddish brown or greenish in color with 1 or 2 nuclei.
At least 4 described species from freshwater and marine habitats.
Type species: Hyalodiscus rubicundus Hertwig & Lesser,  1874

Hyalodiscus rubicundus
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