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 (879)
- Kingdom Animalia (681)
- Kingdom Bacteria (5)
- Kingdom Chromista (179)
- Subkingdom Hacrobia (4)
- Subkingdom Harosa (91)
- Phylum Bacillariophyta
- Phylum Heterokontophyta (84)
- Subphylum Bacillariophytina (84)
- Class Bacillariophyceae (84)
- Subclass Bacillariophyceae incertae sedis
- Subclass Bacillariophycidae (22)
- Subclass Coscinodiscophycidae (57)
- Superorder Biddulphianae (5)
- Superorder Chaetocerotanae (18)
- Superorder Corethranae (1)
- Superorder Coscinodiscanae (16)
- Order Aulacoseirales (2)
- Order Coscinodiscales (9)
- Order Ethmodiscales
- Order Melosirales (4)
- Family Hyalodiscaceae Crawford, 1990 (1)
- Family Melosiraceae Kützing, 1844, sensu emend. (1)
- Genus Melosira C.A. Agardh, 1824 (1)
- Species Melosira discigera Agardh, 1824
- Species Melosira dubia Kützing, 1844
- Species Melosira moniliformis (O.F.Müller) C.Agardh, 1824
- Species Melosira nummuloides C.Agardh, 1824 accepted as Melosira discigera Agardh, 1824
- Species Melosira varians C.Agardh, 1827
- Species Melosira westii W.Smith, 1856 accepted as Pseudopodosira westii (W.Smith) Sheshukova-Poretzskaya & Glezer, 1964 †
- Genus Pseudopodosira A.P. Jousé in A.I. Proschkina-Lavrenko, 1949
- Family Stephanopyxidaceae Nikolaev (2)
- Order Orthoseirales
- Order Paraliales (1)
- Superorder Cymatosirophycanae
- Superorder Lithodesmiophycanae
- Superorder Rhizosolenianae (7)
- Superorder Thalassiosiranae (10)
- Subclass Fragilariophycidae (5)
- Kingdom Plantae (14)
- Kingdom Protozoa