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Veterinary bacteriology: information about important bacteria
Veterinary bacteriology

Species/Subspecies: Mycoplasmoides pneumoniae
Categories: Motile; primarily of interest in human medicin
Etymology: Genus name: similar to mycoplasma (fungus shaped).
Species epithet: of pneumonia.
Significance:  [Important]   
Alternative Species Name(s):Mycoplasma pneumoniae
Type Strain: FH = ATCC 15531 = NCTC 10119.
Macromorphology (smell): Forms small and very typical umbonated colonies ("fried egg appearance"), which can be observed in a microscope.
Micromorphology: Very small and flask shaped or pleomorphic. This bacterium is motile and can glide on surfaces.
Gram +/Gram -:G-, but is normally not gram stained because the cells will then be fragmented.
Metabolism: Striktly aerobic (cf. other mycoplasmas). Energy source: glucose (pH is increased).
Spec. Char.: Lacks a cell wall. Optimal growth temperature: 37°C.
Disease:Atypical pneumonia
HostsDiseaseClinical picture
HumansAtypical pneumoniaMild to severe symptoms with fever and prolonged dry coughing
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_000912 M129 0 816 394 1c + 0 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
M29061 (T) 1465 

About 10 species have been described within the genus Mycoplasmoides. M. pneumoniae is rather closely related to M. gallisepticum. See the phylogenetic tree (Fig. 39:1) where M can mean: Mycoplasma, Mesomycoplasma, Metamycoplasma, Mycoplasmoides or Mycoplasmopsis.
Comment:Mycoplasmas are naturally resistant to penicillin (and other beta-lactams).

Based on whole genome sequencing, the taxonomy of mycoplasmas has recently undergone a comprehensive revision. The new taxonomy has now been introduced in VetBact, but it will still be possible to search for the alternative species names. Read more about the revised taxonomy of the mollicutes under the Term list of VetBact and see also reference 164 below.

Reference(s): No. 164


New names of bacterial phyla

The taxonomic category phylum was previously not regulated by the International Code of Nomenclature of Prokaryotes (ICNP), but now this has changed and it was decided to revise the names of bacterial phyla. All phyla must be written in italics (which has been done on VetBact also before) and have the ending -ota.

Published 2023-03-01. Read more...
The taxonomy of chlamydias

Species within the family Chlamydiaceae were previously divided into two genera Chlamydia and Chlamydophila. However, the differences between these two genera were not that great and many research groups have not accepted this division. Therefore, the genus Chlamydophila has been returned to the genus Chlamydia and this change has now been incorporated in VetBact

Published 2023-03-15. Read more...

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