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    Giardia lamblia, a protozoan (cyst stage) found in water contaminated by animal faeces, coloured scanning electron micrograph (SEM). — Stock Photo
    Giardia lamblia, a protozoan (cyst stage) found in water contaminated by animal faeces, coloured scanning electron micrograph (SEM).
    Aulacodiscus oregonus diatom — Stock Photo
    Aulacodiscus oregonus diatom
    Salt water pennate diatom frustule — Stock Photo
    Salt water pennate diatom frustule
    Group of little barracudas on reef in sea water — Stock Photo
    Group of little barracudas on reef in sea water
    Acrospaera radiolarian shell — Stock Photo
    Acrospaera radiolarian shell
    Shoal of little silver fish underwater — Stock Photo
    Shoal of little silver fish underwater
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Colored scanning electron micrograph of diatoms photosynthetic single-celled algae. — Stock Photo
    Colored scanning electron micrograph of diatoms photosynthetic single-celled algae.
    Campylodiscus fastuosus diatom — Stock Photo
    Campylodiscus fastuosus diatom
    Acrospaera radiolarian shell — Stock Photo
    Acrospaera radiolarian shell
    Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp. — Stock Photo
    Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp.
    Shell of a radiolarian — Stock Photo
    Shell of a radiolarian
    Closeup of fish group floating in blue water near corals — Stock Photo
    Closeup of fish group floating in blue water near corals
    Coloured scanning electron micrograph of fresh water centric diatoms frustules type of algae. — Stock Photo
    Coloured scanning electron micrograph of fresh water centric diatoms frustules type of algae.
    Shoal of fishes in an aquarium, one of them is going the opposite way the others — Stock Photo
    Shoal of fishes in an aquarium, one of them is going the opposite way the others
    Water flea (Polyphemus pediculus), coloured scanning electron micrograph (SEM). — Stock Photo
    Water flea (Polyphemus pediculus), coloured scanning electron micrograph (SEM).
    Plankton. Coloured scanning electron micrograph (SEM) of plankton containing mainly Ceratium dinoflagellates. A few diatoms are also present. Dinoflagellates are unicellular protozoans — Stock Photo
    Plankton. Coloured scanning electron micrograph (SEM) of plankton containing mainly Ceratium dinoflagellates. A few diatoms are also present. Dinoflagellates are unicellular protozoans
    Shoal of beautiful fishes in azure water — Stock Photo
    Shoal of beautiful fishes in azure water
    Colorful exotic fish near reef underwater — Stock Photo
    Colorful exotic fish near reef underwater
    Lychnocanoma radiolarian shell — Stock Photo
    Lychnocanoma radiolarian shell
    Big corals in water with people diving on background — Stock Photo
    Big corals in water with people diving on background
    Plankton. Coloured scanning electron micrograph (SEM) of plankton containing mainly Ceratium dinoflagellates. A few diatoms are also present. Dinoflagellates are unicellular protozoans — Stock Photo
    Plankton. Coloured scanning electron micrograph (SEM) of plankton containing mainly Ceratium dinoflagellates. A few diatoms are also present. Dinoflagellates are unicellular protozoans
    Water flea (Polyphemus pediculus), coloured scanning electron micrograph (SEM). — Stock Photo
    Water flea (Polyphemus pediculus), coloured scanning electron micrograph (SEM).
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    Lychnocanoma radiolarian shell — Stock Photo
    Lychnocanoma radiolarian shell
    Phytoplankton diatom Coscinodiscus sp — Stock Photo
    Phytoplankton diatom Coscinodiscus sp
    Coloured scanning electron micrograph of fresh water centric diatoms frustules type of algae. — Stock Photo
    Coloured scanning electron micrograph of fresh water centric diatoms frustules type of algae.
    Coloured scanning electron micrograph (SEM) of the shell (test) of a Globigerina sp. planktonic foraminiferan. — Stock Photo
    Coloured scanning electron micrograph (SEM) of the shell (test) of a Globigerina sp. planktonic foraminiferan.
    Shell of a radiolarian — Stock Photo
    Shell of a radiolarian
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Liradiscus sp. planktonic unicellular algae — Stock Photo
    Liradiscus sp. planktonic unicellular algae
    Eupodiscus sculptus diatom — Stock Photo
    Eupodiscus sculptus diatom
    Centric fossil diatom frustule — Stock Photo
    Centric fossil diatom frustule
    Big corals in water with people diving on background — Stock Photo
    Big corals in water with people diving on background
    Radiolaria protozoa shells — Stock Photo
    Radiolaria protozoa shells
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda). — Stock Photo
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda).
    Diatoms. Coloured scanning electron micrograph (SEM) of Campylodiscus species diatoms. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species — Stock Photo
    Diatoms. Coloured scanning electron micrograph (SEM) of Campylodiscus species diatoms. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species
    Silica wall of a diatom — Stock Photo
    Silica wall of a diatom
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans. — Stock Photo
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans.
    Eupodiscus sculptus diatom — Stock Photo
    Eupodiscus sculptus diatom