Concise hierarchy

(Kingdom) Protozoa - (Phylum) Opisthosporidia

Subsequent positions

Microsporidia (Subphylum) Balbiani, 1892

Ref: T. Cavalier-Smith, 2022(2021): table 1 (p. 521).

Current position

Microsporidia (Subphylum) Balbiani, 1892

Ref: T. Cavalier-Smith, 2022(2021): table 1 (p. 521). [new position]

Alternative positions

Cnidospora (Subphylum)	Ref: T.I. Storer et al., 1979: 318.
Microspora (Phylum) Sprague, 1977	Ref: E.U. Canning, 1990: 64.
Microsporidia (Phylum) Balbiani, 1882	Ref: T. Cavalier-Smith, 1998: 247.

Historical positions

Microsporidia (Subphylum) Balbiani, 1892	Ref: T. Cavalier-Smith, 2022(2021): table 1 (p. 521). [new position]
Microsporidia (Phylum) Balbiani, 1882	Ref: T. Cavalier-Smith, 1998: table 5 (p. 247).
Microspora (Phylum) Sprague, 1977	Ref: E.U. Canning, 1990: xiii, 64.
Microspora (Phylum) Sprague, 1977	Ref: V. Sprague, 1982: 590.
Cnidospora (Subphylum)	Ref: T.I. Storer et al., 1979: 318.

Number of Subtaxa

2025	Available in Systema Naturae 2000	1o;20f;76g;110s
1989-present	Systema Naturae 2000	[2o;21f;69g]
1998	T. Cavalier-Smith	[2sc]
1997	TAMU	47g
1990	E.U. Canning: 65	[2o;21f;69g]
1982	V. Sprague	2o[22f55g]