Concise hierarchy

(Kingdom) Protozoa

Phylogeny

Paraphyletic/Ancestral (para)		Ref: T. Cavalier-Smith, 2013(2012): 117 ("ancestral (paraphyletic)"), 160 ("paraphyletic").
Probably Paraphyletic/Ancestral (para)		Ref: T. Cavalier-Smith, 2022(2021): table 1 (p. 521: "*").

Ancestor

Sulcozoa (Phylum) Cavalier-Smith, 2012

Ref: T. Cavalier-Smith, 2013(2012): fig. 2.

Descendants

Animalia (Kingdom) Linnaeus, 1758		Ref: T. Cavalier-Smith, 2013(2012): fig. 2.
Fungi (Kingdom) R.T.Moore (1980)		Ref: T. Cavalier-Smith, 2013(2012): fig. 2.

Subsequent positions

Choanozoa (Superphylum) Cavalier-Smith, 1981		Ref: T. Cavalier-Smith, 1993b: table 4 (p. 971).
Opizoa (Infrakingdom) Cavalier-Smith, 2021		Ref: T. Cavalier-Smith, 2022(2021): table 1 (p. 521).

Subsequent entries

Choanofila (Subphylum) Cavalier-Smith, 2009		Ref: T. Cavalier-Smith, 2009: 27.
Corallochytrea (Class) Cavalier-Smith, 1995		Ref: T. Cavalier-Smith, 1995: table (p. 1013).
Paramycia (Subphylum) Cavalier-Smith, 2012		Ref: T. Cavalier-Smith, 2013(2012): table 7 (p. 155).

Current position

Opizoa (Infrakingdom) Cavalier-Smith, 2021

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

Alternative positions

Choanozoa (Superphylum) Cavalier-Smith, 1981	Ref: T. Cavalier-Smith, 1993b: table 4 (p. 971). [new position]
Ciliomyxa (Parvkingdom) Cavalier-Smith, 1993	Ref: T. Cavalier-Smith, 1995: table (p. 1013).
Opisthokonta (Clade) Cavalier-Smith 1987, nom. cl. inval.	Ref: P.M. Kirk et al., 2008: 485. [inferred rank]
opisthokonts ([unranked])	Ref: T. Cavalier-Smith, 2013(2012): fig. 2.
Protozoa (Kingdom) Goldfuss, 1818	Ref: T. Cavalier-Smith, [1991(ined.?)]
Sarcomastigota (Infrakingdom) Cavalier-Smith, 1983	Ref: T. Cavalier-Smith, 2002b: 326.
Sarcomastigota (Subkingdom) Cavalier-Smith, 1983	Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 10).
Sarcomastigota (Superphylum) Cavalier-Smith, 1983	Ref: T. Cavalier-Smith et al., 2015: 357.

Historical positions

Opizoa (Infrakingdom) Cavalier-Smith, 2021	Ref: T. Cavalier-Smith, 2022(2021): table 1 (p. 521), App. (p. 581), fig. 11. [new position]
Protozoa (Kingdom) Goldfuss, 1818	Ref: T. Rees et al., 2020: table 2 (p. 130).
Sarcomastigota (Superphylum) Cavalier-Smith, 1983	Ref: T. Cavalier-Smith et al., 2015: 357.
Sarcomastigota (Subkingdom) Cavalier-Smith, 1983	Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 10).
Eukaryota ([unranked]) Chatton, 1925	Ref: M.J. Benton, 2015: fig. 1.6 (G. Edgecombe). [out of scope (coherent)]
Sarcomastigota (Subkingdom) Cavalier-Smith, 1983	Ref: T. Cavalier-Smith, 2013(2012): table 7 (p. 155), fig. 2.
opisthokonts ([unranked])	Ref: T. Cavalier-Smith, 2013(2012): fig. 2. [alternative position]
Sarcomastigota (Subkingdom) Cavalier-Smith, 1983	Ref: T. Cavalier-Smith, 2010a: fig. 1. [inferred rank]
opisthokonts ([unranked])	Ref: T. Cavalier-Smith, 2010a: fig. 1. [alternative position]
Opisthokonta (Clade) Cavalier-Smith 1987, nom. cl. inval.	Ref: P.M. Kirk et al., 2008: 485.
Sarcomastigota (Subkingdom) Cavalier-Smith, 1983	Ref: T. Cavalier-Smith, 2004: 1252.
Sarcomastigota (Infrakingdom) Cavalier-Smith, 1983	Ref: T. Cavalier-Smith, 2002b: 326.
opisthokonts ([unranked])	Ref: T. Cavalier-Smith, 2002b: 297. [alternative position]
Ciliomyxa (Parvkingdom) Cavalier-Smith, 1993	Ref: T. Cavalier-Smith, 1995: table (p. 1013).
Choanozoa (Superphylum) Cavalier-Smith, 1981	Ref: T. Cavalier-Smith, 1993b: 985, table 4 (p. 971). [new position]
Protozoa (Kingdom) Goldfuss, 1818	Ref: T. Cavalier-Smith, [1991(ined.?)]

Number of Subtaxa

2024	Available in Systema Naturae 2000	4c;8o;20f;94g;124s;1v;2
1989-present	Systema Naturae 2000: 22 Dec 2023	[4c;8o;20f]
2022(2021)	T. Cavalier-Smith: table 1 (p. 521)	4c
2020	T. Rees et al.: table 2 (p. 130)	153ng;108[-114]g; †0g
2013(2012)	T. Cavalier-Smith: table 7 (p. 155)	6c;10o;18f
2002b	T. Cavalier-Smith: 326, 333	[4c]
1993b	T. Cavalier-Smith: table 4 (p. 971)	[1c;1o]