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Phylum Chlorophyta (see text for detail) (green algae) Prasinophyceae Chlorophyceae Ulvophyceae Charophyceae Phylum Euglenophyta (Middle Ordovician-recent) Phylum Dinophyta (dinoflagellates) (?Silurian-recent)

Calciodinellaceae Phylum Heterokontophyta (heterokonts) Bacillariophyceae Dictyochophyceae

Dictyochales Xanthophyceae (yellow-green algae)

Vaucheriales Phaeophyceae (brown algae) Ectocarpales

Ectocarpaceae Laminariales Fucales Cystoseiraceae Phylum Prymnesiophyta (haptophytes) Coccolithophorales Discoasters Phylum Rhodophyta (red algae) Solenoporaceans (artificial group) Rhodophyceae Bangiales Corallinales

Graticulaceae, Sporolithaceae, Corallinaceae Nemaliales Ceramiales

Delesseriaceae Gigartinales Acritarcha (artificial group)

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