Bacteria can be classified in several ways: 1. Based on their morphology, bacteria are grouped as cocci, bacilli, spirilla, etc. depending on whether they are spherical, rod-shaped, spiral-shaped. 2. Bacteria are also classified based on their metabolic activities - whether they require oxygen (aerobic), do not require oxygen (anaerobic), or can survive in extreme conditions. 3. DNA sequencing and cell structure such as cell wall contents, presence of flagella, and formation of endospores are other factors used to classify bacteria into different phyla and groups.

1. Different Types of Bacteria
Based on the desire regarding environmental circumstances pertaining to their own habitat, bacteria
are generally classified into:
This is certainly one of probably the most essential classification type, because it requires into
consideration one with the most important aspect of bacterial growth along with reproduction.
Aerobic bacteria - Bacteria that want oxygen with regard to his or her survival.
Flagellated bacteria - e.g. Once the conditions tend to be favorable, the particular bacteria once
again revert for their original state. There are a quantity involving different types of bacteria, and so
they are found everywhere as well as in almost all forms of environment. You can find numerous
categories of bacteria, which in turn belong to the exact same loved ones and also have evolved from
the same bacteria (ancestor). Let's have a look.
Bacteria are generally grouped as 'Gram positive' as well as 'Gram negative' bacteria, based about
the results involving Gram staining method. Endospores can help bacteria survive regarding an
extraordinary number of years in a dormant state.
Lentisphaerae
Gram-positive bacteria - The Particular thick layer associated with Peptidoglycans will be stained
purple by the crystal violet dye, which can be why gram-positive bacteria appear purple or even
blue.
Thermotogae
As talked about earlier, a variety of bacteria thrive inside varied environment. That They come in
various forms and sizes, in supplement to always be able to their dimension is measured within
micrometer - that can become a millionth portion of your meter. Set Up the mutual give-and-take
relationship along with host.
Acidobacteria
Based about the morphology, DNA sequencing, conditions needed along with biochemistry,
scientists have got occur up with the next classification using 28 distinct bacterial phyla:
Based on Morphology, DNA Sequencing, and Biochemistry
Mesophiles - These which in turn require moderate circumstances to survive.
Chloroflexi
Lopotrichous Bacteria - Flagellae just at one location about the body
Elusimicrobia
Peritrichous Bacteria - Flagellae just about all over the actual body

2. Bacteria which in turn form endospores tend to be typically a lot more virulent naturally than those
which don't.
Thermodesulfobacteria
Spiral-shaped bacteria (Spirilla) - e.g. This kind of article will offer you the particular classification of
these micro-organisms depending on every 1 involving these factors, too as a couple of other factors.
Alkaliphiles - Individuals which in turn may tolerate high pH conditions.
Thermophiles - These which in turn can resist substantial temperature.
Saprophytic Bacteria - Obtain Nutrition via dead and also decaying matter. Treponema along with
Borellia
Extremophiles - These that may survive within intense conditions.
Comma-shaped bacteria - e.g. Flagellae tend to be usually used for swimming.
Some bacteria form endospores, which are very tough as well as impenetrable outer shells, when
subjected to unfavorable conditions. if that they are associated to each other despite his or her
different shapes. Peptidoglycans tend to be the main contents of the cell walls associated with Gram-
positive bacteria (almost 95%), while Gram-negative bacteria have an additional layer associated
with phospholipids and also lipopolysaccharides.
Planctomycetes
Rod-shaped bacteria (Bacilli) - e.g. Staphylococcus as well as Streptococcus
Acidophiles - Individuals which could tolerate lower pH conditions.
Chlamydiae
Based upon Formation of Spores
Some bacteria possess whip-like structures in their own entire body which usually assist with
motility, but that's certainly not the only means in order to obtain motility. DNA sequencing works
well for understanding the relationship in between two kinds of bacteria i.e. Such bacteria are
typically present in areas below your surface in the Earth or perhaps deep inside oceans.
Fusobacteria
Flagellae present - These are furthur classified depending on how many flagellae these people
possess and their area around the body.
Dictyoglomi
Fibrobacteres
Halophiles - those that can easily survive within extremely saline conditions.

3. Deferribacteres
Classification involving Bacteria
Pathogenic Bacteria - Obtain meals through host but these people are harmful for the host, typically
causing diseases.
Osmophiles - Individuals which usually may survive inside high sugar osmotic conditions.
Bacteroidetes
Symbiotic Bacteria - Obtain nutrition coming from host organism by giving one thing in return.
Nearly All of the bacteria may be classified into the subsequent shapes:
Flagellae absent - Atrichous Bacteria
Anaerobic bacteria - Bacteria that won't call for oxygen regarding survival.
Gemmatimonadetes
Nitrospira
Before the invention associated with DNA sequencing technique, bacteria were mainly classified
depending on their shapes - additionally called morphology, biochemistry, and staining - i.e. Add
with it the particular fact, that will these bacteria are also constantly evolving and also adapting
towards the environment wherein survival of living items continues to be deemed impossible (The
ultimate example would become the bacteria which inhabit the actual brine lakes associated with
Mediterranean Sea wherein your salinity ranges way exceed the salinity ranges involving normal sea
water.), and the task becomes a tad more difficult.
Polytrichous Bacteria - Multiple flagellae from various locations
Spirochaetes
Actinobacteria
As currently mentioned, prior to the advent of DNA sequencing, bacteria were classified depending
on their particular forms as well as biochemical properties. Alongside with all the shape along with
DNA sequence, other items such as their metabolic activities, circumstances needed for their own
growth, biochemical reactions (i.e., biochemistry as stated above), antigenic properties, and other
characteristics will furthermore be useful in classifying your bacteria.. However, each of these kinds
possess their own peculiar characteristics - which have evolved right after separation from your
original species. Environmentally useful.
Caldiserica
Tenericutes
Deinococcus-Thermus
Bacteria may also be classified based around the element oxygen pertaining to his or her survival.

4. Anaerobic bacteria can't bear oxygen and could even die if held in an oxygenated environment.
Vibrio Cholera
The lot of diversity that you get to see inside bacterial species makes it Herculean job in order to
come up with a single classification which will include every single species. Throughout a broad
sense, this bacterial classification includes bacteria that are located in several kinds of environment
for example fresh-water bacteria, saline-water bacteria, bacteria that will survive extreme
temperatures (as within sulfur-water-spring bacteria along with bacteria present in Antarctica ice),
bacteria that may survive in very acidic environment, bacteria that will survive throughout extremely
alkaline environment, bacteria that can withstand high radiations, aerobic bacteria, anaerobic
bacteria, autotrophic bacteria, heterotrophic bacteria, and thus on...
Bacteria (singular: bacterium) tend to be single-celled organisms which usually are simply in any
position to be observed through the microscope. E.Coli and also Salmonella
Based about presence of Flagellae
Based upon Approach regarding Obtaining Nutrition
Chemoautotrophic Bacteria - Synthesize their particular meals with the aid of power obtained from
chemical sources.
Aquificae
Photoautotrophic Bacteria - Synthesize their really own food via organic matter, mild power and also
carbon-dioxide.
Chrysiogenetes
Endospore forming bacteria
Synergistetes
Gram-negative bacteria - The Actual thin layer of Peptidoglycans cannot retain your crystal violet
dye, and so seem red or pink credited for the retention in the counter-stain.
Psychrophilic bacteria - These that can easily survive very cold conditions.
Amphitrichous Bacteria - 1 flagella about either side in the body
Based upon Cell Wall Contents (Staining Methods)
Gram staining is a crucial method involving bacterial identification, nevertheless you can easily find
a couple of bacteria that do not necessarily react to always be able to it. Tetanus Bacteria
Chlorobi
Some bacteria have got different, more advanced styles compared for you to the ones pointed out
above.
Verrucomicrobia

5. Heterotrophic Bacteria - Obtain their own meals from other living organisms, because they cannot
synthesize it about their particular own.
Non-endospore forming bacteria
Though bacteria are usually mainly classified into phylum i.e. Your classification associated with
bacteria is depending on many factors like morphology, DNA sequencing, dependence on oxygen
and carbon-dioxide, staining methods, presence involving flagellae, cell structure, etc. Hence, a
couple of some other teams tend to be Gram-variable and Gram-indeterminate.
Spherical-shaped bacteria (Cocci) - e.g. possibly Gram positive as well as Gram negative staining.
These types of endospores let the bacteria to outlive these conditions by remaining in a dormant
state. Although several species could withstand intense conditions, others need certain moderate
circumstances to survive. Nowadays, together using the morphology, DNA sequencing can in
addition be utilized in order to end up being able to classify bacteria. the scientific classification of
organisms, they will could be categorized into the next groups regarding simplification. Based in
regardless associated with whether bacteria form endospores or even not, they may well be
classified to the subsequent two types.
Based on Shapes
Neutrophiles - Individuals which need moderate conditions for you to survive.
Cyanobacteria
Proteobacteria
Firmicutes
Based on Requirement involving Oxygen
Monotrichous Bacteria - 1 flagella
Based in Environment
Each phylum further corresponds towards the quantity of species along with genera regarding
bacteria