Between brackets is the number of accepted extant species
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Shows the number of accepted extant species within the taxon
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- Biota (12 686)
- Kingdom Animalia (9 792)
- Kingdom Archaea (1)
- Kingdom Bacteria (310)
- Kingdom Chromista (956)
- Subkingdom Chromobiota
- Subkingdom Cryptista accepted as Cryptophyta
- Subkingdom Hacrobia (58)
- Subkingdom Harosa (627)
- Infrakingdom Alveolata (269)
- Infrakingdom Heterokonta (110)
- Phylum Bigyra (2)
- Phylum Ochrophyta (106)
- Subphylum Khakista
- Subphylum Ochrophyta incertae sedis
- Subphylum Phaeista
- Class Bolidophyceae (5)
- Class Chrysomeridophyceae (1)
- Class Chrysophyceae (18)
- Class Dictyochophyceae (4)
- Class Eustigmatophyceae (8)
- Class Pelagophyceae
- Class Phaeophyceae (28)
- Subclass Dictyotophycidae (4)
- Subclass Fucophycidae (24)
- Order Ascoseirales (1)
- Order Desmarestiales (6)
- Order Ectocarpales (11)
- Family Acinetosporaceae Hamel ex J. Feldmann, 1937 (3)
- Genus Geminocarpus Skottsberg, 1907 (2)
- Genus Pylaiella Bory de Saint-Vincent, 1823 (1)
- Species Pylaiella littoralis (Linnaeus) Kjellman, 1872
- Family Adenocystaceae F. Rousseau, B. de Reviers, M.-C. Leclerc, A. Asensi & R. Delépine (2)
- Family Chordariaceae Greville, 1830 (4)
- Family Ectocarpaceae C. Agardh, 1828
- Family Myrionemataceae Nägeli, 1847
- Family Pylaiellaceae
- Family Scytosiphonaceae Farlow, 1881 (2)
- Order Fucales (2)
- Order Laminariales (1)
- Order Ralfsiales (2)
- Order Scytothamnales (1)
- Class Phaeothamniophyceae
- Class Raphidophyceae
- Class Xanthophyceae (42)
- Phylum Oomycota (2)
- Infrakingdom Rhizaria (248)
- Phylum Chromeridophyta
- Phylum Bacillariophyta
- Phylum Heterokontophyta (271)
- Phylum Xanthophyta accepted as Xanthophyceae
- Kingdom Fungi (740)
- Kingdom Plantae (822)
- Kingdom Protozoa (65)
