The term diplobacillus (plural: diplobacilli) refers to a cellular arrangement consisting of a pair of rod-shaped cells.

Diplobacillus

The term streptobacillus (plural: streptobacilli) describes a cellular arrangement where rod-shaped cells, or rectangles, are connected to form a long chain.

Streptobacillus

The term palisade (plural: palisades) refers to a cellular arrangement of rod-shaped cells that form a V-shaped or L-shaped formation.

Palisade

The term bacillus (plural: bacilli) refers to rod-shaped prokaryotic cells. In taxonomy, Bacillus is also a genus of low G+C gram-positive bacteria, many of which can form resilient endospores.

Bacillus

- Bacillus
- Diplobacillus
- Streptobacillus
- Palisade

University of Wisconsin - Madison

In addition to their individual cellular shape, prokaryotic cells of the same species may group together into distinctive arrangements. These characteristic groupings are determined by the plane of cell division. The most commonly observed groupings are the various arrangements of cocci and 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

- Coccus
- Diplococcus
- Tetrad
- Streptococcus
- Staphylococcus 

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