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Mycoplasmataceae is a family of bacteria in the order Mycoplasmatales. This family consists of the genera  and Mycoplasma .
In 1967, the order Mycoplasmatales was incorporated into the class Mollicutes.
Many species are sexually transmitted and cause  pelvic inflammatory disease.
Mycoplasma refers to a genus of bacteria that lack a cell wall and possess a three-layered cellular membrane. They can be  parasitic or saprotrophic. Several species are sexually transmitted and pathogenic in humans. Others are found on cats, dogs, and barnyard fowl.
Ureaplasma Ureaplasma is the second of two genera of bacteria belonging to the family Mycoplasmataceae. As the name implies, ureaplasma is urease positive.
It includes the species:
Ureaplasma parvum has been identified as being a commensal in the uterus as part of the microbiome in healthy women of reproductive age. 
^ E.A. Freundt
International Bulletin of Bacteriological Nomenclature and Taxonomy, 1955, 5, 67-78.] (See page 73) The classification of the pleuropneumonia group of organisms (Borrelomycetales)
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