Concise hierarchy

(Kingdom) Chromalveolata

Current position

Hacrobia ([unranked]) Okamoto, Chantangsi, Horák, Leander & Keeling, 2009

Ref: E.J. van Nieukerken, 2010: 78.

Alternative positions

Cryptista (Subkingdom) Caval.-Sm. (1986)	Ref: T. Cavalier-Smith, 1998: 252.
cryptomonads ([unranked])	Ref: J.O. Corliss, 1984: abstract.
Cryptophyta (Subkingdom) Caval.-Sm. (1986)	Ref: T. Cavalier-Smith, 1986: 338. [new taxon]
Cryptophytobionta (Kingdom)	Ref: E. Möhn, 1984
Eukaryota ([unranked]) Chatton, 1925	Ref: E.E. Ruppert et al., 2004: fig. 3.37. [inferred rank]
Protoctista (Kingdom) Hogg, 1860	Ref: M. Gillott, 1990: 139.

Historical positions

Hacrobia ([unranked]) Okamoto, Chantangsi, Horák, Leander & Keeling, 2009	Ref: E.J. van Nieukerken, 2010: 78.
Eukaryota ([unranked]) Chatton, 1925	Ref: E.E. Ruppert et al., 2004: fig. 3.37. [inferred rank]
Cryptista (Subkingdom) Caval.-Sm. (1986)	Ref: T. Cavalier-Smith, 1998: table 7 (p. 252).
Cryptista (Infrakingdom) Caval.-Sm. (1989)	Ref: T. Cavalier-Smith, 1993b: table 2 (p. 961). [invalid/synonym] [implicit]
Protoctista (Kingdom) Hogg, 1860	Ref: M. Gillott, 1990: xiii, 139-151.
cryptomonads ([unranked])	Ref: J.O. Corliss, 1984: abstract.
Cryptophytobionta (Kingdom)	Ref: E. Möhn, 1984
Protoctista (Kingdom) Hogg, 1860	Ref: L. Margulis & K.V. Schwartz, 1982: 84-85.

Number of Subtaxa

1989-present	Systema Naturae 2000	1c;2o;8f;30g;200s
1990	M. Gillott: xiii, 139	1c;[2o];8/3f;23/13g;60s