Concise hierarchy

(Kingdom) Pseudomonadati - (Phylum) Chlamydiota - (Class) Chlamydiia - (Order) Chlamydiales - (Family) Chlamydiaceae

Subsequent positions

Pirellulae (Phylum) Margulis and Schwartz 1998 nom. ined.

Ref: L. Margulis & K.V. Schwartz, 1998: 94. [assumed]

Current position

Chlamydiaceae (Family) Rake 1957 (Approved Lists 1980)

Ref: G.M. Garrity et al., 2007: 541; LPSN[13 Apr 2026].

Alternative positions

Pirellulae (Phylum) Margulis and Schwartz 1998 nom. ined.	Ref: L. Margulis & K.V. Schwartz, 1998: 94. [rough position]
Rickettsias and Chlamydias (Class)	Ref: L. Margulis & K.V. Schwartz, 1982: 57. [rough position]

Historical positions

Chlamydiaceae (Family) Rake 1957 (Approved Lists 1980)	Ref: J.P. Euzéby, 2016: [8 Sep 2017]. [available name]
Chlamydiaceae (Family) Rake 1957 (Approved Lists 1980)	Ref: G.M. Garrity et al., 2007: 541.
Chlamydiaceae (Family) Rake 1957 (Approved Lists 1980)	Ref: G.M. Garrity et al., 2001b: 24.
Chlamydiaceae (Family) Rake 1957 (Approved Lists 1980)	Ref: G.M. Garrity & J.G. Holt, 2001a: 165.
Pirellulae (Phylum) Margulis and Schwartz 1998 nom. ined.	Ref: L. Margulis & K.V. Schwartz, 1998: 94. [rough position]
Rickettsias and Chlamydias (Class)	Ref: L. Margulis & K.V. Schwartz, 1982: 57, 58. [rough position]
Chlamydiales (Order) Storz and Page 1971 (Approved Lists 1980)	Ref: L.A. Page, 1982: 41.

Number of Subtaxa

2026	Available in Systema Naturae 2000	3s
1989-present	Systema Naturae 2000	[3s]
2007	G.M. Garrity et al.	[3s]
1982	L.A. Page	2s