A dinoflagellate with nematocysts is

Nematodinium

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Ceratium

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Gonyaulax

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Symbodinium.

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Solution

The correct option is B Nematodinium
Nematodinium is a dinoflagellate having nematocyst which is a subcellular structure containing extrusive filaments.
It is different from the one found in cnidarians. Ceratium (having horns), Gonyaulax (having resting cysts) and symbodinium (have mucocyst) do not have nematocyst.
The correct answer is A.

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