The next sequence shows how a cell of Hyalotheca dissilens is attacked by Hyalodiscus rubicundus.

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Hyalodiscus rubicundus

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Hyalodiscus rubicundus penetrates the mucous layer around the algae.

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The amoeba reaches the cell membrane of the algae and starts to open a cell. This process lasts for about 10 minutes.

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Suddenly, within seconds, a large part of the cell content moves into the amoeba. This goes fast.

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The next 15 minutes Hyalodiscus pulls all the remaining pieces of the chloroplast in its cytoplasm.

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The job is done.

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Hyalodiscus moves to the neighboring cell and the process starts again.

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16 minutes later the cell is open.

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When Hyalodiscus is filled with food, it builds a digestive cyst.

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After some days the amoeba (left, orange spot) leaves its cyst, leaving indigestible residue behind.

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Holes made by Hyalodiscus in cell walls of Hyalotheka dissilens.

Hyalodiscus, after feeding on Hyalotheca