Scientific classification
Kingdom: Bacteria
Phylum: Chlamydiae
Class: Chlamydiae
Order: Chlamydiales

Candidatus Piscichlamydia salmonis♠ Draghi et al. 2004
Candidatus Criblamydiaceae♠
Candidatus Rhabdochlamydiaceae

The bacterial order Chlamydiales includes only obligately intracellular bacteria that have a chlamydia-like developmental cycle of replication and at least 80% 16S rRNA or 23S rRNA gene sequence identity with other members of Chlamydiales. Chlamydiales live in animals, insects, and protozoa. The order Chlamydiales belongs to the class Chlamydiae, phylum Chlamydiae, domain Bacteria.

At present, Chlamydiae and Chlamydiales are essentially synonymous.

Currently, the order Chlamydiales includes the families Chlamydiaceae, Simkaniaceae, and Waddliaceae, which have Gram-negative extracellular infectious bodies (EBs), and Parachlamydiaceae, which has variable Gram staining of EBs. The family Rhabdochlamydiaceae has been proposed.


♠ Strain found at the National Center for Biotechnology Information (NCBI) but has no standing with the Bacteriological Code (1990 and subsequent Revision) as detailed by List of Prokaryotic names with Standing in Nomenclature (LPSN) as a result of the following reasons:
• No pure culture isolated or available for Prokayotes.
• Not validly published because the effective publication only documents deposit of the type strain in a single recognized culture collection.
• Not approved and published by the International Journal of Systematic Bacteriology or the International Journal of Systematic and Evolutionary Microbiology (IJSB/IJSEM).


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