Diplococcus

A diplococcus (plural diplococci) is a round bacterium (a coccus) that typically occurs in the form of two joined cells. Examples of gram-negative diplococci are Neisseria sp., Moraxella catarrhalis, Acinetobacter, and Brucella. Examples of gram-positive diplococci would be Streptococcus pneumoniae and enterococcus.^[1]

The word diplococcus is derived from "diplo", meaning double, and "coccus", meaning berry (referring to its spherical, ovoid, and generally round shape).

In former times, a bacterial genus Diplococcus was recognized, but it is not used anymore.

References

↑ Richard A. Harvey (Ph.D.) (2007). Microbiology. Lippincott Williams & Wilkins. pp. 395–. ISBN 978-0-7817-8215-9.

Microbiology: Bacteria

Medical
microbiology

Biochemistry
and ecology

Oxygen preference	Aerobic Obligate Anaerobic Facultative Obligate Microaerophile Nanaerobe Aerotolerant

Other	Microbial metabolism Primary nutritional groups Nitrogen fixation Microbial ecology Human flora Gut flora Skin flora Vaginal flora Substrate preference Lipophilic Saccharophilic

Morphology:
Shapes

Morphology:
Structures

Cell envelope	Cell membrane Cell wall: Peptidoglycan NAM NAG DAP Gram-positive bacteria only: Teichoic acid Lipoteichoic acid Endospore Gram-negative bacteria only: Bacterial outer membrane Porin Lipopolysaccharide Periplasmic space Mycobacteria only: Arabinogalactan Mycolic acid

Outside envelope	Bacterial capsule Slime layer S-layer Glycocalyx Pilus Fimbria

Composite	Biofilm

Bacterial
taxonomy

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