An order or taxonomic grouping of dinoflagellates, single-celled organisms with characteristic whip-like flagella.
Derived from dinoflagellate with the Greek '-ida' or '-ida' suffix used in biological taxonomy to denote an order-level classification.
The '-ida' ending in biology is like putting organisms in ever-larger containers: Dinoflagellida is the big box containing many smaller groups of these spinning ocean cells.
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