The Cardiobacteriaceae are a family of

Pseudomonadota Pseudomonadota (synonym Proteobacteria) is a major phylum of Gram-negative bacteria. The renaming of phyla in 2021 remains controversial among microbiologists, many of whom continue to use the earlier names of long standing in the literature. The ...

, given their own order. They are

Gram-negative Gram-negative bacteria are bacteria that do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. They are characterized by their cell envelopes, which are composed of a thin peptidoglycan cell wall ...

and rod-shaped, with diameters around 0.5 to 1.7 μm and lengths from 1–6 μm.George M. Garrity: ''Bergey's Manual of Systematic Bacteriology'' 2. Auflage. Springer, New York, 2005, Volume 2: The Proteobacteria, Part B: The Gammaproteobacteria

References

Gammaproteobacteria {{gammaproteobacteria-stub