Dinoflagellata has two flagella, one equatorial and one longitudinal. It uses these two flagella to whirl around (which is what their name means. dino in dinoflagellata means to whirl).
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Tamara Fedorovna Vozzhennikova has written:
'Fossil dinoflagellates from Jurassic, Cretaceous, and Paleogene
deposits of the USSR' -- subject(s): Dinoflagellata, Fossil, Fossil
Dinoflagellata, Paleobotany, Russia
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Dinoflagellata and Pyrrophyta are two seperate Phylums, but
share some of the same members. Pyrrophyta encompasses more
organisms, and a working dichotomous key cannot have two phylum
that share any of the same members; it defeats the point of
seperating the organisms in the first place.
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Noctiluca is a dinoflagellate in the Domain Eukaryota,
Superphylum Alveolata, Phylum Dinoflagellata, in the class
Noctiluciphyceae, and in the order Noctilucales.