Bacilli is a class of low G+C gram-positive bacteria that includes both rod-shaped and spherical (coccus-shaped) species, such as the genera Bacillus and Staphylococcus.

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Low G+C gram-positive bacteria are a diverse group of microorganisms characterized by having less than 50% guanine and cytosine nucleotides in their DNA. This category contains multiple classes and genera of bacteria, including several significant pathogens.

Low G+C gram positive bacteria

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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

Clostridia are a group of low G+C gram-positive bacteria that are typically obligate anaerobes and capable of producing endospores.

Clostridia

Mycoplasmas are gram positive bacteria even though they lack a cell wall. They were identified by being gram positive because of their low G+C content genome. 

Mycoplasmas 

The genus *Mycoplasma* consists of more than $${}100$$ species of bacteria that lack a cell wall and are classified as low G+C gram-positive bacteria, despite not staining with Gram-stain reagents. These bacteria are extremely small, with some diameters around $${}0.2$$ μm, which is smaller than certain large viruses. Due to the absence of a cell wall, *Mycoplasma* cells are pleomorphic, meaning they lack a fixed shape, can assume diverse forms, and may resemble tiny animal cells, making them challenging to identify.

Mycoplasmas

Bacilli

Lactobacillales is an order of low G+C gram-positive bacteria that includes the genera Enterococcus, Lactobacillus, Leuconostoc, and Streptococcus.

Lactobacillales

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

The term staphylococcus (plural: staphylococci) describes a cellular arrangement where spherical cells (cocci) form grape-like clusters. Taxonomically, Staphylococcus is a genus of low G+C gram-positive bacteria.

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