True bacteria with rigid cell walls.
A very large group of bacteria with rigid cell walls and (typically) flagella for movement. The group comprises the so called true bacteria, excluding those, such as spirochetes and mycoplasmas, with flexible cell walls.
A group of single-celled organisms without a defined cell nucleus or organelles. They contain peptidoglycans in their cell walls. Eubacteria are prokaryotes and include many familiar microorganisms, (e.g., Escherichia, Helicobacter, Legionella, nitrogen-fixing bacteria, Spirochetes, and staphylococci.) In some classification systems the other prokaryotes also include the archaebacteria and cyanobacteria. In other taxonomic systems the archaebacteria are considered to be a separate kingdom or domain.