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  • Growth of red calcareous algae, tiny green algae, diatoms and blue-green bacteria as seen through a microscope. FOV is about 0,3x0,2mm.
    17130-D.jpg
  • Pennate diatoms from the genus Licmophora typically growing epiphytic on other microscopic algae.
    17149-D.jpg
  • Diatoms from the genus Licmophora. These diatoms are usually found epiphytic on other algae. The largest cells are about 0,020mm long.
    17147-D.jpg
  • Microphoto of symbiotic algae (zooxanthellae) from the dinoflagellate family Symbiodiniaceae (probably genus Cladocopium).  Sampled from a soft coral (Sinularia sp.).
    17086-D.jpg
  • Blue-green bacteria from hawaii, probably Oscillatoria sp.
    17133-D.jpg
  • Micro samples of dark brown to dark red cyanobacteria growing in a small tropical marine aquarium. Probably Oscillatoria sp.
    17136-D.jpg
  • Cyanobacteria from the genus Oscillatoria sampled from a marine aquarium.
    17140-D.jpg
  • Cyanobacteria, probably Nostoc sp., sampled from a marine tropical aquarium.
    17141-D.jpg
  • Cyanobacteria, Spirulina sp., from a marine aquarium.
    17143-D.jpg
  • Cyanobacteria from Hawaii, probably Lyngbya sp. The diameter of each string is about 0,06mm (60 micro meters).
    17134-D.jpg
  • Red cyanobacteria, probably Schizothrix sp., sampled from a marine aquarium.
    17144-D.jpg
  • Cyanobacteria from Hawaii, probably Lyngbya sp.
    17135-D.jpg
  • Cyanobacteria from the genus Oscillatoria sampled from a marine aquarium.
    17139-D.jpg
  • Micro samples of dark brown to dark red cyanobacteria growing in a small tropical marine aquarium. Probably Oscillatoria sp. The thricome is about 0,045 mm across.
    17137-D.jpg
  • Micro photo of red cyanobacteria growing in a marine aquarium as a bright, red slimy film on the window. Possibly Schizothrix sp. og Calothrix sp.
    17142-D.jpg
  • Dinoflagellates from the genus Ceratium and two cells of Protoperidinium depressum in a sample collected from the waters of southern Norway in early June 2010.
    17179-D.jpg
  • Diatoms from the genera Nitzschia or Cylindrodrotheca. The largest cells are about 0,050mm long.
    17145-D.jpg
  • A trichoblast growing on the apex of the thallus of Polysiphonia sp.
    17150-D.jpg
  • Tetrasporangia forming in the cells of the sporophyte of Polysiphonia sp.
    17151-D.jpg
  • Dinoflagellates from the genera Dinophysis and Ceratium seen through a microscope.  Collected from the waters of southern Norway in early June 2010.
    17152-D.jpg
  • Diatom from the genus Rhizosolenia, possibly R. styliformis.
    17051-D.jpg
  • Vegetative division in a pinnate diatom from the genus Nitzschia or Cylindrotheca. The cell is about 0,050mm long.
    17146-D.jpg
  • Diatoms from the genus Striatella. The square cell is about 0,070 x 0,056 mm in size.
    17148-D.jpg
  • Dinoflagellates from the genus Ceratium and two cells of Protoperidinium depressum in a sample collected from the waters of southern Norway in early June 2010.
    17153-D.jpg
  • Cyanobacteria belonging to the genus Lyngbya.
    17138-D.jpg
  • Flagellates from the genus Amphidinium collected from a marine aquarium. The cells are about 35x30 micrometer across.
    17180-D.jpg
  • Sexual reproduction among two dinoflagellates (Diplopsalis sp.?), sample collected from a marine aquarium.
    17154-D.jpg
  • Flagellates of the geenera Amphidinium (yellow) and Diplopsalis (red) together with a single diatom cell and a chain of cyanobacteria. Sample collected from a marine aquarium.
    17155-D.jpg
  • Waves hitting the shoreline where seaweed grow.
    116103-D.jpg
  • Flagellates from the genus Amphidinium collected from a marine aquarium.
    17156-D.jpg
  • Waves hitting the shoreline where seaweed grow.
    116106-D.jpg
  • Common Guillemots, Hornøya, Finnmark, Norway. Nikon D810, 70-200mm @ 160mm, f4.5, EV+0.67, 1/2500sec, ISO250, Aperture priority, stack of two images
    Common Guillimots (43030-D).jpg
  • Large flocks of common guillemots (Uria aalge) flying over the bird cliff of Hornøya, Finnmark Norway.
    43032-D.jpg
  • Diatom from the genus Coscinodiscus. South-western Norway, May 2011. The alga is about 0,006mm across.
    17126-D.jpg
  • Parmecium bursaria with endosymbiotic green algae (Zoochlorella sp.) from a freshwater culture.
    17193-D.jpg
  • Symbiotic algae (zooxanthellae) from Aiptasia sp., probably belonging to the spaceis Breviolum dendrogyrum.  The individual cells are in average about 8 µm in diameter. Do note the cell near bottom that is dividing.
    17191-D.jpg
  • Symbiotic algae (zooxanthellae) from Aiptasia sp., probably belonging to the spaceis Breviolum dendrogyrum.  The individual cells are in average about 8 µm in diameter.
    17190-D.jpg
  • Large, single-celled algae cells of the genus Halaosphaera, (probably H. viridis). The cells are app.130µm in diameter. Photo from Hidra, south-western Norway in late April 2009.
    17024-D.jpg
  • Large, single-celled algae cells of the genus Halaosphaera, (probably H. viridis). The cells are app.130µm in diameter. Photo from Hidra, south-western Norway in late April 2009.
    17026-D.jpg
  • Diatoms from the genus Coscinodiscus. South-western Norway, May 2011. The algae are about 0,006mm across.
    17127-D.jpg
  • Symbiotic algae (zooxanthellae) from Aiptasia sp., probably belonging to the speceis Breviolum dendrogyrum.  The individual cells are in average about 8 µm in diameter.
    17189-D.jpg
  • Symbiotic algae (zooxanthellae) from Aiptasia sp., probably belonging to the spaceis Breviolum dendrogyrum.  The individual cells are in average about 8 µm in diameter.
    17186-D.jpg
  • Symbiotic algae (zooxanthellae) from a zoanthid (Zoanthidea) from the Indo-Pacific. The cells are in average about 9 µm in diameter.
    17187-D.jpg
  • Large, single-celled algae cells of the genus Halaosphaera, (probably H. viridis). The cells are about 120µm in diameter. Photo from Hidra, south-western Norway in April 2021.
    112145-D.jpg
  • Harbour Seal (Phoca vitulina) on brown algae (Laminaria sp.) from south-western Norway.
    55802-D.jpg
  • Large, single-celled algae cells of the genus Halaosphaera, (probably H. viridis). The cells are app.130µm in diameter. Photo from Hidra, south-western Norway in late April 2009.
    17025-D.jpg
  • Microphoto of symbiotic algae (zooxanthellae) from the dinoflagellate family Symbiodiniaceae (probably genus Cladocopium).  Sampled from a soft coral (Sinularia sp.).
    17083-D.jpg
  • Microphoto of symbiotic algae (zooxanthellae) from the dinoflagellate family Symbiodiniaceae (probably genus Cladocopium).  Sampled from a soft coral (Sinularia sp.).
    17084-D.jpg
  • Microscopic photo of symbiotic algae (zooxanthellae) of the dinoflagellat genus Cladocopium.  Sampled from a soft coral (Sinularia sp.).
    17181-D.jpg
  • Small stream running over algae- and moss-covered rock in Trollfjorden, Lofoten, Norway.
    24736-D.jpg
  • A roundworm embedded in microscopic green, filamentous algae. Collected from a marine aquarium.
    6092-D.jpg
  • Juvenile Harbour Seal (Phoca vitulina) on brown algae (Laminaria sp.) from south-western Norway.
    55804-D.jpg
  • Various microscopic algae including flagellates, diatomes and filamentous green algae as well av cyanobacteria.
    17118-D.jpg
  • Microphoto of symbiotic algae (zooxanthellae) from the dinoflagellate family Symbiodiniaceae (probably genus Cladocopium).  Sampled from a soft coral (Sinularia sp.).
    17085-D.jpg
  • Microscopic oligochaet bristle worm from the genus Stylaria (family Naididae) photographed in a nutrient rich freshwater culture. Close up of the anterior end with eyespots and proboscis. A nematode (round worm) is also seen.
    17200-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17067-D.jpg
  • Diverse marine plancton sample from south-western Norway in August. Copepod naupli are numerous.
    17069-D.jpg
  • Cyanobacteria (Arthrospira platensis - often called "Spirulina") sampled from Lake Nakuru, Kenya. The longest colony is about 0,14mm long.
    17111-D.jpg
  • Cyanobacteria (Arthrospira platensis - often called "Spirulina") sampled from Lake Nakuru, Kenya. The colony is about 0,12mm long photographed at 200X at the film plane.
    17108-D.jpg
  • Cyanobacteria (Arthrospira platensis - often called "Spirulina") sampled from Lake Nakuru, Kenya. The colony is about 0,096mm long.
    17105-D.jpg
  • Social feeding groups of the "Powder Blue Tang", Acanthurus leucosternon, on a shallow reef flat in the Maldives.
    2908.jpg
  • Zooxanthellae from a soft coral (probably Sinularia sp.). The individual cells are bout 10-12 µm in diameter.
    17192-D.jpg
  • Zooxanthellae from a soft coral (probably Sinularia sp.). The individual cells are bout 10-12 µm in diameter.
    17188-D.jpg
  • Dinoflagellate Ceratium horridum from coastal surface waters of south-western Norway.
    17162-D.jpg
  • Harbour Seal (Phoca vitulina) from south-western Norway.
    55801-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17071-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17076-D.jpg
  • Cyanobacteria (Arthrospira platensis - often called "Spirulina") sampled from Lake Nakuru, Kenya.
    17109-D.jpg
  • Cyanobacteria (Arthrospira platensis - often called "Spirulina") sampled from Lake Nakuru, Kenya.
    17110-D.jpg
  • Cyanobacteria (Arthrospira platensis - often called "Spirulina") sampled from Lake Nakuru, Kenya. The upper left bacteria is about 0,08mm long. Shot at 100X at the film plane.
    17106-D.jpg
  • Microscopic photo of red cyanobacteria from Hawaii.  Unidentified genus and species.
    17132-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17068-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17073-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17074-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17075-D.jpg
  • Microscopic oligochaet bristle worm from the genus Stylaria (family Naididae) photographed in a nutrient rich freshwater culture. Bar is 200 micrometer.
    17197-D.jpg
  • Harbour Seal (Phoca vitulina) from south-western Norway.
    55798-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17077-D.jpg
  • Cyanobacteria (Arthrospira platensis - often called "Spirulina") sampled from Lake Nakuru, Kenya. The largest colony is about 0,12mm long. 200X at the film plane.  At bottom right is a rotifer.
    17107-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17072-D.jpg
  • Marine Iguana, Amblyrhynchus cristatus, scraping tiny algae for food from the lava rocky beach at James Bay, Santiago, Galapagos.
    3465-D.jpg
  • Dictyonema glabratum, a cyanolichen that contain symbiotic cyanobacteria instead of green algae like most lichens do. Photo from LaSelva rainforest, Ecuador.
    216057-D.jpg
  • Achilles Surgeonfish (Acanthurus achilles) feeding on algae in an aquarium.
    35383-D.jpg
  • Dictyonema glabratum, a cyanolichen that contain symbiotic cyanobacteria instead of green algae like most lichens do. Photo from LaSelva rainforest, Ecuador.
    216058-D.jpg
  • Marine Water Fleas (Branchiopoda) from the genus Evadne, probably E. nordmanni.  The green balls are large algae from the genus Halosphaera (Prasinophyceae).
    17065-D.jpg
  • Marine Water Fleas (Branchiopoda) from the genus Evadne, probably E. nordmanni.  The green balls are large algae from the genus Halosphaera (Prasinophyceae).
    17064-D.jpg
  • 4 different planctonic algae: Halosphaera sp. (ball-shaped), Diatoms (Nitzschia sp. and Rhizosolenia sp.) and  a dinoflagellate from the genus Ceratium (upper right).
    17080-D.jpg
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Alf J. Nilsen Natural History images

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