What are Some Types of Bacteria?
Bacteria are the largest group of single-celled organisms on Earth, and make up the bulk of the world’s known biomass. There are an incredible number of types of bacteria on the planet, with the majority not yet classified. A number of what were once considered types of bacteria are, since the 1990s, now considered part of a separate domain, that of archaea. Different types of bacteria can have vastly differing characteristics, with the main common trait being their lack of a differentiated nucleus. Different phyla are generally classed into two different groups as either having an outer membrane or lacking an outer membrane, with a number of phyla as yet undetermined. Some types of bacteria are incredibly small, such as those in the genus Mycoplasma, which are as tiny as the largest viruses, at around 0.3 micrometers. Other types of bacteria are relatively gargantuan, such as Epulopiscium fishelsoni, which can actually be visible to the naked eye, although still very small at about ha
