Hyalodiscus rubicundus
Hyalodiscus rubicundus

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.

Hyalodiscus rubicundus  notice the fine filopodia
Hyalodiscus rubicundus
Hyalodiscus rubicundus
Nucleus, arrowed
Hyalodiscus rubicundus
Hyalodiscus rubicundus
Hyalodiscus rubicundus, with very fine filopodia
Hyalodiscus rubicundus
Hyalodiscus rubicundus in Phase contrast; note the vacuoles, granules and filopodia

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Hyalodiscus rubicundus
Hyalodiscus rubicundus
Nucleus
Hyalodiscus rubicundus
Hyalodiscus rubicundus
Note the fine filopodia which arise from the surface of the veil.
Hyalodiscus rubicundus
Drawings: Ferry Siemensma
Hyalodiscus rubicundus
Drawings: Ferry Siemensma
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