<unk>  is a genus of spherical Gram-positive bacteria, belonging to the phylum Firmicutes and the lactic acid bacteria group.  Cellular division occurs along a single axis in these bacteria, and thus they grow in chains or pairs, hence the name — from Greek<unk> tos, meaning easily bent or twisted, like a chain. Contrast this with staphylococci, which divide along multiple axes and generate grape-like clusters of cells.<unk> tococci are oxidase– and catalase–negative.
Streptococcus
Pseudomonas
Neisseria
Enterococcus
Arcobacter
Bacteroides
Coccus
Lactobacillus