Examples of unicellular

Organisms are all the living beings that make up the different spaces on the planet , which are made up of one or more cells, that is, minimal units of life made up of cytoplasm, one or more nuclei and a membrane that surrounds them. Within the organisms are the unicellular ones, which are those forms of life whose body only has a single cell, and which are often classified as prostists or bacteria.

These types of organisms are the smallest and simplest , they live in multiple places and perform metabolic functions such as photosynthesis or the decomposition of organic matter, as well as being characterized by being pathogenic such as the bacillus or beneficial such as the penicillin fungus.

examples of unicellular bacteria

Enterococcus faecium stayyereyofhia mioms Bacillus brevis
Streptococcus faecalis Bacillus licheniformis Enterococcus galllinarum
Streptococcus cricetus Streptococcus pyogenes Acetobacter aurantius
Bacillus mycoides Streptococcus sanguis Streptococcus oralis
Enterococcus maloratus Bacillus anthracis Streptococcus lactis
Streptococcus avium Agrobacterium radiobacter Enterococcus avium
Streptococcus sobrinus Bacillus megaterium Bacillus subtilis
Actinomyces Israelii Enterococcus maloratus Streptococcus rattus
Bacillus fusiformis Streptococcus gallinarum Enterococcus durans

examples of unicellular protozoa


apostomatia nassophorea Heterotrichea
Peritrichia Spirotrichea colpodea
Trichostomatia Astomatia Plagiopylea
suctoria Hypotrichia Rhynchodia
lithostomatea Chonotrichia Karyorelictea
Oligotrichia Scuticociliatia Haptoria

examples of unicellular fungi

Penicillium Aspergillus Mucor
Cladosporium alternate

examples of unicellular algae

Euglenophytes chrysophytes Noctiluca
Diatoms Dinoflagellates

More examples of unicellular organisms


Amoebas are protozoans characterized by their changing and irregular shape and by moving their cytoplasm based on pseudopods, which also use it to trap microscopic substances through what is known as phagocytosis. Generally, they tend to live free in water or on land, and sometimes, thanks to their size, they can be kept in laboratories.


Paramecia are unicellular eukaryotic organisms belonging to the genus Paramecium , which have a membrane covered with microflagella that gives them the opportunity to move quickly in the aquatic environment , whether they are puddles or ponds. They are characterized by having a nucleus with DNA and reproduce asexually through bipartition and sexual reproduction through conjugation.


Euglenas are unicellular protists belonging to the Euglenidae group and live in very small places , for example, between grains of sand or other sediments on the bottoms of seas, rivers and lakes. They are characterized by making their own food thanks to photosynthesis, although they also feed on organic matter that is already made.


Archaea or also called archaebacteria, are a large group of unicellular prokaryotic microorganisms that can be found in very hostile conditions, that is why they are called extremophiles. They live in the soil, swamps, and even in the human colon, the ocean being the place where they live the most.


Bacteria are the best known unicellular prokaryotic microorganisms on planet Earth, as well as being the oldest and the ones that cause the most infections.

They stand out for presenting multiple shapes, for example, spheres, rods and filaments, in addition to not having a well-defined nucleus and internal membranous organelles. You must not forget that bacteria are essential for life and ecosystems.

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