Nomenclature
In 1966, chlamydiae were recognized as bacteria and the genus Chlamydia was validated. The Order Chlamydiales was created by Storz and Page in 1971. Between 1989 and 1999, new families, genera, and species were recognized. The phylum Chlamydiae was established in Bergey's Manual of Systematic Bacteriology.
By 2006, genetic data for over 350 chlamydial lineages had been reported, four chlamydial families had been recognized (Chlamydiaceae, Parachlamydiaceae, Simkaniaceae, and Waddliaceae), and another family had been proposed (Rhabdochlamydiaceae).
Read more about this topic: Chlamydiae