Coccus bacteria are round and spherical in shape.

Coccus

Diplococcus is the an arrangement of two cocci cells. 

Diplococcus

A tetrad is a grouping of four cocci in a square.

Tetrad

Streptococcus is a chain of cocci cells. It is also a diverse genus of bacteria that are further classified on which molecules they produce that can cause an immune response.

Streptococcus

Staphylococcus is a cluster of cocci cells.

Staphylococcus

- Coccus
- Diplococcus
- Tetrad
- Streptococcus
- Staphylococcus 

University of Wisconsin - Madison

- Arrangements of Cocci
- Arrangements of Bacilli

Common Prokaryotic Cellular Arrangements

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

OpenStax Microbiology Textbook

Common Arrangements of Cocci

- Bacillus
- Diplobacillus
- Streptobacillus
- Palisade

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