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Unicellular Collection

Unicellular organisms, such as diatoms and blue-green algae, are fascinating to explore under the scanning electron microscope (SEM

Background imageUnicellular Collection: Acrosphaera radiolarian, SEM

Acrosphaera radiolarian, SEM
Acrosphaera radiolarian. Coloured scanning electron micrograph (SEM) of the shell of a Acrosphaera sp. radiolarian. Radiolaria are single-celled protozoans that are found in marine plankton

Background imageUnicellular Collection: Diatom, SEM

Diatom, SEM
Diatom. Coloured scanning electron micrograph (SEM) of the Arachnoidiscus sp. diatom. The diatoms are a group of photosynthetic, single- celled algae containing about 10, 000 species

Background imageUnicellular Collection: Diatom, SEM

Diatom, SEM
Diatom. Coloured scanning electron micrograph (SEM) of a Stephanopyxis sp. diatom. Diatoms are single-celled photosynthetic algae, of which there are about 100, 000 species

Background imageUnicellular Collection: Diatom, SEM

Diatom, SEM
Diatom. Coloured scanning electron micrograph (SEM) of a Triceratium morlandii diatom. Diatoms are single-celled photosynthetic algae, of which there are about 100, 000 species

Background imageUnicellular Collection: Microcystis blue-green alga

Microcystis blue-green alga
Blue-green algae. Coloured transmission electron micrograph of a single cell of the blue-green algae Microcystis aeruginosa (also known as Anacystis cyanea)

Background imageUnicellular Collection: Diatom alga, SEM

Diatom alga, SEM
Diatom. Coloured scanning electron micrograph (SEM) of the surface of the mineralised cell wall (frustule) of an unidentified diatom. This is a planktonic unicellular alga

Background imageUnicellular Collection: Foraminifera, SEM

Foraminifera, SEM
Foraminifera. Coloured scanning electron micrograph (SEM) of a selection of foraminiferans, including Oolina hexagona (bottom right) and a number of Lagena sp

Background imageUnicellular Collection: Diatom frustule, SEM

Diatom frustule, SEM
Diatom frustule. Coloured scanning electron micrograph (SEM) of the frustule of a Pinnularia sp. diatom

Background imageUnicellular Collection: Oxytricha ciliate protozoan, SEM C019 / 0253

Oxytricha ciliate protozoan, SEM C019 / 0253
Oxytricha sp. ciliate protozoan, coloured scanning electron micrograph (SEM). Oxytricha is a tiny single-celled aquatic organism

Background imageUnicellular Collection: Fossilised diatoms, SEM

Fossilised diatoms, SEM

Background imageUnicellular Collection: Dinoflagellate plankton, SEM

Dinoflagellate plankton, SEM
Dinoflagellate plankton. Coloured scanning electron micrograph (SEM) of the calcareous (calcium-based) test (shell) of a dinoflagellate Calciodinellum sp

Background imageUnicellular Collection: Dinoflagellates, SEM

Dinoflagellates, SEM
Dinoflagellates. Coloured scanning electron micrograph (SEM) of Prorocentrum dinoflagellates (round) and Ceratium dinoflagellates (branched). Dinoflagellates are unicellular protozoans

Background imageUnicellular Collection: Diatom cell wall, SEM

Diatom cell wall, SEM
Diatom cell wall. Coloured scanning electron micrograph (SEM) of the pattern of small holes, called striae, in the cell wall of a diatom alga. This is a Coscinodiscus sp. diatom

Background imageUnicellular Collection: Diatom alga, SEM

Diatom alga, SEM
Diatom. Coloured scanning electron micrograph (SEM) of a Biddulphia sp. diatom. This is a marine planktonic unicellular alga. It has a mineralised cell wall (frustule) divided into two halves

Background imageUnicellular Collection: Plate 3 Stentor Ciliata from Kunstformen der Natur (Art Forms in Nature) illustrated by Ernst Haeckel (1834-1919)

Plate 3 Stentor Ciliata from Kunstformen der Natur (Art Forms in Nature) illustrated by Ernst Haeckel (1834-1919)
5615749 Plate 3 Stentor Ciliata from Kunstformen der Natur (Art Forms in Nature) illustrated by Ernst Haeckel (1834-1919) by Haeckel

Background imageUnicellular Collection: Pink anemonefish (Amphiprion perideraion) with anemone showing the effects of bleaching

Pink anemonefish (Amphiprion perideraion) with anemone showing the effects of bleaching

Background imageUnicellular Collection: Bacillus bacterial genus

Bacillus bacterial genus

Background imageUnicellular Collection: Picture No. 11014631

Picture No. 11014631
Diatom Scanning Electron Micrograph (SEM): Magnification x5275 (if print A4 size: 29.7 cm wide) - The diatoms are single celled algae

Background imageUnicellular Collection: Picture No. 11014632

Picture No. 11014632
Diatom Scanning Electron Micrograph (SEM): Magnification x 4370 (if print A4 size: 29.7 cm wide) - The diatoms are single celled algae

Background imageUnicellular Collection: Paramecium sp. protozoan, SEM

Paramecium sp. protozoan, SEM
Paramecium protozoan. Coloured scanning electron micrograph (SEM) of a Paramecium sp. protozoan. This single-celled organism is aquatic, living in freshwater habitats

Background imageUnicellular Collection: Euglena gracilis, SEM

Euglena gracilis, SEM
Euglena gracilis protists. Coloured scanning electron micrograph (SEM) of Euglena gracilis protists. These organisms possess a unique combination of plant and animal characters. Like the algae, E

Background imageUnicellular Collection: Amoeba protozoa, SEM

Amoeba protozoa, SEM
Amoeba protozoa. Coloured scanning electron micrograph (SEM) of four Amoeba sp. protozoa, showing their numerous pseudopodia (cytoplasmic extensions, leg-like)

Background imageUnicellular Collection: Didinium ciliate protozoan, SEM C019 / 0235

Didinium ciliate protozoan, SEM C019 / 0235
Didinium sp. ciliate protozoan, coloured scanning electron micrograph (SEM). This tiny single-celled organism is found in freshwater and marine habitats

Background imageUnicellular Collection: Euglena gracilis

Euglena gracilis protists. Light micrograph of a group of Euglena gracilis protists. These organisms possess a unique combination of plant and animal characters. Like the algae, E

Background imageUnicellular Collection: Paramecium bursaria protozoan, micrograph

Paramecium bursaria protozoan, micrograph
Paramecium bursaria protozoan, light micrograph. This ciliate protozoan inhabits freshwater, where it feeds mainly on bacteria

Background imageUnicellular Collection: Paramecium protozoa, light micrograph

Paramecium protozoa, light micrograph
Paramecium bursaria protozoa, light micrograph. These ciliate protozoa inhabit freshwater, where they feed mainly on bacteria

Background imageUnicellular Collection: Paramecium protozoan, light micrograph

Paramecium protozoan, light micrograph
Paramecium protozoan. Differential interference contrast micrograph of a Paramecium sp. protozoan. This ciliate protozoan inhabits freshwater, where it feeds mainly on bacteria

Background imageUnicellular Collection: Trichodina parasite, light micrograph

Trichodina parasite, light micrograph
Trichodina parasite. Differential interference contrast micrograph of Trichodina pediculus. This ciliate parasite lives on the skin, gills and mucous membranes of many aquatic animals

Background imageUnicellular Collection: African trypanosomiasis in the red blood cells

African trypanosomiasis in the red blood cells. African trypanosomiasis, also known as sleeping sickness, is a parasitic infection caused by protozoa

Background imageUnicellular Collection: Conceptual image of Trypanosoma

Conceptual image of Trypanosoma

Background imageUnicellular Collection: Picture No. 10754505

Picture No. 10754505
Red Snow / Watermelon Snow - caused by unicellular algae. At c. 11, 500 ft. (Chlamydomonas nivalis) Date:

Background imageUnicellular Collection: SEM of Paramecium

SEM of Paramecium
Paramecium. Coloured scanning electron micrograph (SEM) of the single-celled protozoan, Paramecium caudatum

Background imageUnicellular Collection: Amoebae, SEM

Amoebae, SEM
Amoebae. Coloured scanning electron micrograph (SEM) of two large protozoan amoebae (Amoeba proteus). A. proteus is commonly found on the bottom of pools and puddles

Background imageUnicellular Collection: Diatom, light micrograph C014 / 4673

Diatom, light micrograph C014 / 4673
Diatom. Differential interference contrast micrograph of a Gyrosigma sp. diatom. Diatoms are a group of photosynthetic, single-celled algae containing about 10, 000 species

Background imageUnicellular Collection: Scenedesmus algae, SEM C014 / 1461

Scenedesmus algae, SEM C014 / 1461
Scenedesmus algae. Coloured scanning electron micrograph (SEM) of Scenedesmus sp. algae. Scenedesmus is a nonmotile colonial green algae that has its cells arranged in a row

Background imageUnicellular Collection: Holosticha ciliate protozoan, SEM

Holosticha ciliate protozoan, SEM
Holosticha ciliate protozoan. Coloured scanning electron micrograph (SEM) of a Holosticha sp. ciliate protozoan ingesting diatoms (blue). Holosticha is a tiny single-celled aquatic organism

Background imageUnicellular Collection: Euplotes protozoa, SEM C016 / 9040

Euplotes protozoa, SEM C016 / 9040
Euplotes protozoa. Coloured scanning electron micrograph (SEM) showing the upperside (bottom) and underside (top) of two Euplotes sp. hypotrich ciliate protozoa

Background imageUnicellular Collection: Climacostomum protozoan, SEM C016 / 9063

Climacostomum protozoan, SEM C016 / 9063
Climacostomum protozoan. Coloured scanning electron micrograph (SEM) of a Climacostomum sp. unicellular ciliate protozoan, showing the cells large oral apparatus (round, centre)

Background imageUnicellular Collection: Syphilis bacteria, artwork C016 / 8956

Syphilis bacteria, artwork C016 / 8956
Syphilis bacteria. Computer artwork of the spirochaete bacteria Treponema pallidum, which cause syphilis

Background imageUnicellular Collection: Tabellaria diatoms, SEM C016 / 9599

Tabellaria diatoms, SEM C016 / 9599
Tabellaria diatoms. Coloured scanning electron micrograph (SEM) of a Tabellaria sp. diatom colony. Diatoms are a group of photosynthetic, single-celled algae containing about 10, 000 species

Background imageUnicellular Collection: Euglena flagellate protozoa, SEM C016 / 9103

Euglena flagellate protozoa, SEM C016 / 9103
Euglena flagellate protozoa. Coloured scanning electron micrograph (SEM) of two Euglena sp. flagellate protozoa. Euglena sp

Background imageUnicellular Collection: Desmids and spirogyra, light micrograph C016 / 9595

Desmids and spirogyra, light micrograph C016 / 9595
Desmids and spirogyra. Polarised light micrograph of two Micrasterias rotata desmids (round) and a single filament of Spirogyra sp. green alga (lower right)

Background imageUnicellular Collection: Climacostomum protozoan, SEM C016 / 9121

Climacostomum protozoan, SEM C016 / 9121
Climacostomum protozoan. Coloured scanning electron micrograph (SEM) of a Climacostomum sp. unicellular ciliate protozoan, showing the cells large oral apparatus (round, centre)

Background imageUnicellular Collection: Climacostomum protozoan, SEM C016 / 9061

Climacostomum protozoan, SEM C016 / 9061
Climacostomum protozoan. Coloured scanning electron micrograph (SEM) of a Climacostomum sp. unicellular ciliate protozoan, showing the cells large oral apparatus (round, upper right)

Background imageUnicellular Collection: Fossil diatom, light micrograph C016 / 8603

Fossil diatom, light micrograph C016 / 8603
Fossil diatom. Darkfield illuminated light micrograph of a fossilised diatom. Diatoms are a group of photosynthetic, single-celled algae containing about 10, 000 species

Background imageUnicellular Collection: Climacostomum protozoan, SEM C016 / 9120

Climacostomum protozoan, SEM C016 / 9120
Climacostomum protozoan. Coloured scanning electron micrograph (SEM) of a Climacostomum sp. unicellular ciliate protozoan, showing the cells large oral apparatus (round, centre)

Background imageUnicellular Collection: Climacostomum protozoan, SEM C016 / 9065

Climacostomum protozoan, SEM C016 / 9065
Climacostomum protozoan. Coloured scanning electron micrograph (SEM) of a Climacostomum sp. unicellular ciliate protozoan, showing the cells large oral apparatus (round, upper right)

Background imageUnicellular Collection: Euglena flagellate protozoa, SEM C016 / 9104

Euglena flagellate protozoa, SEM C016 / 9104
Euglena flagellate protozoa. Coloured scanning electron micrograph (SEM) of two Euglena sp. flagellate protozoa. Euglena sp

Background imageUnicellular Collection: Tabellaria diatoms, SEM C016 / 9600

Tabellaria diatoms, SEM C016 / 9600
Tabellaria diatoms. Coloured scanning electron micrograph (SEM) of a Tabellaria sp. diatom colony. Diatoms are a group of photosynthetic, single-celled algae containing about 10, 000 species

Background imageUnicellular Collection: Climacostomum protozoan, SEM C016 / 9064

Climacostomum protozoan, SEM C016 / 9064
Climacostomum protozoan. Coloured scanning electron micrograph (SEM) of a Climacostomum sp. unicellular ciliate protozoan, showing the cells large oral apparatus (round, centre)

Background imageUnicellular Collection: Climacostomum protozoan, SEM C016 / 9122

Climacostomum protozoan, SEM C016 / 9122
Climacostomum protozoan. Coloured scanning electron micrograph (SEM) of a Climacostomum sp. unicellular ciliate protozoan, showing the cells large oral apparatus (round, centre)

Background imageUnicellular Collection: Netrium desmid, light micrograph C016 / 9591

Netrium desmid, light micrograph C016 / 9591
Netrium desmid. Polarised light micrograph of a Netrium sp. desmid (oval, centre) among peat moss (Sphagnum sp.) leaves (green)

Background imageUnicellular Collection: Hartmannella vermiformis protozoa cysts C016 / 9402

Hartmannella vermiformis protozoa cysts C016 / 9402
Hartmannella vermiformis protozoa cysts. Transmission electron micrograph (TEM) of a section through cysts (round) containing Hartmannella vermiformis protozoa. H

Background imageUnicellular Collection: Legionella infected protozoan, TEM C016 / 9412

Legionella infected protozoan, TEM C016 / 9412
Legionella infected protozoan. Transmission electron micrograph (TEM) of a section through a single-celled Tetrahymena pyriformis protozoan, infected with Legionella pneumophila bacteria (yellow)

Background imageUnicellular Collection: Tabellaria diatoms, SEM C016 / 9601

Tabellaria diatoms, SEM C016 / 9601
Tabellaria diatoms. Coloured scanning electron micrograph (SEM) of a Tabellaria sp. diatom colony. Diatoms are a group of photosynthetic, single-celled algae containing about 10, 000 species

Background imageUnicellular Collection: Micrasterias desmids, light micrograph C016 / 9596

Micrasterias desmids, light micrograph C016 / 9596
Micrasterias desmids. Rheinberg illuminated light micrograph of Micrasterias rotata desmid green algae. Desmids are a common group of freshwater single-celled algae that have intricate cell walls

Background imageUnicellular Collection: Euplotes protozoa, SEM C016 / 9041

Euplotes protozoa, SEM C016 / 9041
Euplotes protozoa. Coloured scanning electron micrograph (SEM) showing the upperside (bottom) and underside (top) of two Euplotes sp. hypotrich ciliate protozoa

Background imageUnicellular Collection: Climacostomum protozoan, SEM C016 / 9062

Climacostomum protozoan, SEM C016 / 9062
Climacostomum protozoan. Coloured scanning electron micrograph (SEM) of a Climacostomum sp. unicellular ciliate protozoan, showing the cells large oral apparatus (round, upper right)

Background imageUnicellular Collection: Giardia protozoan, SEM C016 / 9398

Giardia protozoan, SEM C016 / 9398
Giardia protozoan. Coloured scanning electron micrograph (SEM) of a Giardia sp. trophozoite protozoan (yellow) attached to the lining of a human intestine

Background imageUnicellular Collection: Ciliate protozoan ingesting algae

Ciliate protozoan ingesting algae. Darkfield illuminated light micrograph of a ciliate protozoan ingesting green algae (green)

Background imageUnicellular Collection: Desmid, light micrograph

Desmid, light micrograph
Desmid. Darkfield illuminated light micrograph of a desmid green alga. Desmids are a common group of freshwater single-celled algae that have intricate cell walls

Background imageUnicellular Collection: Tetrahymena protozoan, SEM

Tetrahymena protozoan, SEM
Tetrahymena protozoan. Coloured scanning electron micrograph (SEM) of a Tetrahymena sp. ciliate protozoan

Background imageUnicellular Collection: Amoeboid protozoa, SEM

Amoeboid protozoa, SEM
Amoeboid protozoa. Differential interference contrast (DIC) micrograph of four Thecamoeba sp. amoebozoa. Amoebozoa are a major group of amoeboid protozoa, motile single-celled organisms

Background imageUnicellular Collection: Haematococcus alga, light micrograph

Haematococcus alga, light micrograph
Haematococcus alga. Differential interference contrast (DIC) micrograph of a Haematococcus sp. green alga. Magnification: x670, when printed 10 centimetres wide

Background imageUnicellular Collection: Euastrum desmid, light micrograph

Euastrum desmid, light micrograph
Euastrum desmid. Darkfield illuminated light micrograph of a Euastrum oblongum desmid green alga. Desmids are a common group of freshwater single-celled algae that have intricate cell walls

Background imageUnicellular Collection: Microcoleus cyanobacteria, SEM

Microcoleus cyanobacteria, SEM
Microcoleus cyanobacteria. Coloured scanning electron micrograph (SEM) of Microcoleus sp. filamentous cyanobacteria (blue-green algae). Magnification: x 1300, when printed 10 centimetres wide

Background imageUnicellular Collection: Xanthidium desmids, light micrograph

Xanthidium desmids, light micrograph
Xanthidium desmids. Polarised light micrograph of a Xanthidium sp. desmid green algae. Desmids are a common group of freshwater single-celled algae that have intricate cell walls

Background imageUnicellular Collection: Desmids, light micrograph

Desmids, light micrograph
Desmids. Phase contrast light micrograph of Micrasterias sp. and Hyalotheca sp. desmid green algae. Desmids are a common group of freshwater single-celled algae that have intricate cell walls

Background imageUnicellular Collection: Microalgae, light micrograph

Microalgae, light micrograph
Microalgae. Differential interference contrast (DIC) micrograph of Botryococcus braunii (round), and other species of green alga. Magnification: x278, when printed 10 centimetres wide

Background imageUnicellular Collection: Closterium desmid, light micrograph

Closterium desmid, light micrograph
Closterium desmid. Differential interference contrast (DIC) micrograph of a Closterium sp. desmid green alga

Background imageUnicellular Collection: Haematococcus algae, light micrograph

Haematococcus algae, light micrograph
Haematococcus algae. Differential interference contrast (DIC) micrograph of a colony of Haematococcus sp. green alga. Magnification: x220, when printed 10 centimetres wide

Background imageUnicellular Collection: Ciliate protozoan, light micrograph

Ciliate protozoan, light micrograph
Ciliate protozoan. Darkfield illuminated light micrograph of a ciliate protozoan, showing green algae (green) that it has ingested

Background imageUnicellular Collection: Bambusina desmids, light micrograph

Bambusina desmids, light micrograph
Bambusina desmids. Polarised light micrograph of a colony of Bambusina sp. desmid green algae. Desmids are a common group of freshwater single-celled algae that have intricate cell walls

Background imageUnicellular Collection: Prokaryote cell, artwork C016 / 6263

Prokaryote cell, artwork C016 / 6263
Prokaryote cell. Computer artwork showing the internal structure of a typical prokaryotic cell

Background imageUnicellular Collection: Prokaryote and eukaryote cells, artwork C016 / 6259

Prokaryote and eukaryote cells, artwork C016 / 6259
Prokaryote and eukaryote cells. Computer artwork comparing typical prokaryotic (top) and eukaryotic (bottom) cells

Background imageUnicellular Collection: Cytoskeleton in unicellular parasite, SEM C018 / 0518

Cytoskeleton in unicellular parasite, SEM C018 / 0518
Cytoskeleton in unicellular parasite, coloured scanning electron micrograph (SEM). All cells have a support and transport network called the cytoskeleton

Background imageUnicellular Collection: Foraminiferan shell, SEM C018 / 0312

Foraminiferan shell, SEM C018 / 0312
Foraminiferan shell, SEM

Background imageUnicellular Collection: Yeast cells, illustration C018 / 0750

Yeast cells, illustration C018 / 0750
Yeast cells. Illustration of cells of brewer s, or baker s, yeast (Saccharomyces cerevisiae). This fungus consists of single vegetative cells

Background imageUnicellular Collection: Yeast cells, illustration C018 / 0752

Yeast cells, illustration C018 / 0752
Yeast cells. Illustration of cells of brewer s, or baker s, yeast (Saccharomyces cerevisiae). This fungus consists of single vegetative cells. S

Background imageUnicellular Collection: Scenedesmus algae, SEM C014 / 1462

Scenedesmus algae, SEM C014 / 1462
Scenedesmus algae. Coloured scanning electron micrograph (SEM) of Scenedesmus sp. algae. Scenedesmus is a nonmotile colonial green algae that has its cells arranged in a row

Background imageUnicellular Collection: Spirostomum ciliate protozoan, SEM C019 / 0308

Spirostomum ciliate protozoan, SEM C019 / 0308
Spirostomum sp. ciliate protozoan, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats

Background imageUnicellular Collection: Blepharisma ciliate protozoan, SEM C019 / 0228

Blepharisma ciliate protozoan, SEM C019 / 0228
Blepharisma ciliate protozoan, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats

Background imageUnicellular Collection: Didinium ciliate protozoan, SEM C019 / 0237

Didinium ciliate protozoan, SEM C019 / 0237
Didinium sp. ciliate protozoan, coloured scanning electron micrograph (SEM). This tiny single-celled organism is found in freshwater and marine habitats

Background imageUnicellular Collection: Spirostomum ciliate protozoan, SEM C019 / 0307

Spirostomum ciliate protozoan, SEM C019 / 0307
Spirostomum sp. ciliate protozoan, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats



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Unicellular organisms, such as diatoms and blue-green algae, are fascinating to explore under the scanning electron microscope (SEM). Their intricate structures and diverse forms never cease to amaze scientists. Take a closer look at these microscopic wonders. In the world of diatoms, their beauty lies in their silica-based cell walls. Under SEM, we can observe the delicate patterns etched onto their frustules, showcasing nature's artistic touch. Microcystis blue-green alga is another unicellular organism that catches our attention. Its vibrant blue color stands out amidst other microscopic lifeforms. SEM allows us to appreciate its unique shape and structure up close. Moving on to Acrosphaera radiolarian, a type organism known for its intricate skeletal structure resembling a miniature work of art. SEM reveals every tiny detail of this beautiful creature. Even in ancient times, diatoms left behind fossilized remains that continue to captivate researchers today. Through SEM imaging, we can witness these preserved diatom shells from ages past and gain insights into Earth's history. Dinoflagellates are yet another group organisms worth exploring under SEM. These remarkable creatures possess flagella that enable them to move with grace through water bodies while displaying stunning shapes and patterns when magnified. Let's not forget about Oxytricha ciliate protozoan. This peculiar-looking creature exhibits an array of hair-like projections called cilia which aid in locomotion and feeding. Thanks to SEM technology, we can marvel at its intricately structured body. Unicellular lifeforms like diatom algae have so much more than meets the eye – or even what traditional microscopes reveal. With SEM imaging techniques available today, scientists uncover hidden details within these tiny organisms that contribute immensely to our understanding of biodiversity and evolution. So next time you come across a mention of "unicellular, " remember the vast world waiting beneath the surface, waiting to be explored through SEM.

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