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  • Dinophyte from the genus Ceratium (possibly C. tripos).
    17047-D.jpg
  • Dinophyte from the genus Ceratium (possibly C. tripos).
    17048-D.jpg
  • Red cyanobacteria, probably Schizothrix sp., sampled from a marine aquarium.
    17144-D.jpg
  • Diatoms from the genus Striatella. The square cell is about 0,070 x 0,056 mm in size.
    17148-D.jpg
  • Vegetative division in a pinnate diatom from the genus Nitzschia or Cylindrotheca. The cell is about 0,050mm long.
    17146-D.jpg
  • Cyanobacteria from Hawaii, probably Lyngbya sp.
    17135-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 Hawaii, probably Lyngbya sp. The diameter of each string is about 0,06mm (60 micro meters).
    17134-D.jpg
  • Blue-green bacteria from hawaii, probably Oscillatoria sp.
    17133-D.jpg
  • Cyanobacteria, Spirulina sp., from a marine aquarium.
    17143-D.jpg
  • Diatoms from the genera Nitzschia or Cylindrodrotheca. The largest cells are about 0,050mm long.
    17145-D.jpg
  • Pennate diatoms from the genus Licmophora typically growing epiphytic on other microscopic algae.
    17149-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
  • Cyanobacteria, probably Nostoc sp., sampled from a marine tropical aquarium.
    17141-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
  • Ciliates from the genus Paramecium feeding on bacteria i a fresh water culture.
    17195-D.jpg
  • Dinoflagellate Ceratium horridum from coastal surface waters of south-western Norway.
    17162-D.jpg
  • The planktonic Crustacean Calanus finmarchicus. Lateral view.
    17055-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17072-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
  • 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
  • Cross section of the liver with glycogen storage.
    17043-D.jpg
  • Cross section of olfactory ephitelium in the nasal cavity.
    17044-D.jpg
  • Ciliates from the genus Paramecium feeding on bacteria i a fresh water culture.
    17194-D.jpg
  • Vascular bundle in the leaf stem of Plantago major (Common Plantain).
    17101-D.jpg
  • Cyanobacteria (Arthrospira platensis - often called "Spirulina") sampled from Lake Nakuru, Kenya. The longest colony is about 0,14mm long.
    17111-D.jpg
  • The planktonic Crustacean Calanus finmarchicus, the most common zooplankton in the North Sea.
    17052-D.jpg
  • Flagellates from the genus Amphidinium collected from a marine aquarium.
    17156-D.jpg
  • Microscopic oligochaet bristle worm photographed in a nutrient rich freshwater culture.
    17201-D.jpg
  • Microscopic photo of symbiotic algae (zooxanthellae) of the dinoflagellat genus Cladocopium.  Sampled from a soft coral (Sinularia sp.).
    17181-D.jpg
  • Planktoni crustacea from the genus Calanus collected in surface waters of south-western Norway.
    17165-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17077-D.jpg
  • The planktonic Crustacean Calanus finmarchicus, the most common zooplankton in the North Sea. Dorsal view.
    17053-D.jpg
  • Cross section of a kidney with several glomerolus visible.
    17030-D.jpg
  • Vascular bundle in the leaf stem of Plantago major (Common Plantain).
    17099-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.
    17202-D.jpg
  • Cross section of muscle tissue.
    17033-D.jpg
  • Section of the Little Brain (Cerebellum) with Purkinje cells.
    17039-D.jpg
  • Stinging cells (nematocysts) in the tentacles of the Lion's Mane jellyfish (Cyanea capillata)
    17066-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17076-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
  • Vascular bundle from maize (Zea mays).
    17097-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
  • Smooth muscle tissue.
    17036-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17067-D.jpg
  • Marine Water Fleas (Branchiopoda) from the genus Evadne, probably E. nordmanni.
    17063-D.jpg
  • Planctonic dinoflagellates from the genus Ceratium.
    17079-D.jpg
  • Ciliate from the genus Paramecium feeding on bacteria i a fresh water culture.
    17198-D.jpg
  • Planktonic dinoflaggelates from genus Ceratium collected from coastal surface waters of south-western norway.
    17175-D.jpg
  • Cross section through a testes with immature sperm cells clearly visible.
    17034-D.jpg
  • Ovary with ovarian follicles clearly visible.
    17035-D.jpg
  • Dense connective tissue known as Elastic or Yellow Cartilage
    17037-D.jpg
  • Cross section of the large intestine.
    17041-D.jpg
  • Cross section of the optic nerve.
    17046-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
  • The planktonic Crustacean Calanus finmarchicus. Lateral view.
    17054-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
  • 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
  • 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
  • Radiolaria from the genus Acanthometra collected from surface waters of south-western Norway.
    17163-D.jpg
  • Cross section of the lung with bronchioles, alveoli and blood vessels visible.
    17032-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
  • Cross section of the small intestine.
    17040-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
  • Diverse marine plancton sample from south-western Norway in August.
    17075-D.jpg
  • Planctonic dinoflagellates from the genus Ceratium.  South-western Norway in August.
    17078-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
  • Vascular bundle from maize (Zea mays).
    17096-D.jpg
  • Red bone marrow.
    17029-D.jpg
  • Cross section of the retina.
    17031-D.jpg
  • Cross section of the skin from human head with "hair sacs" (papilla of hair), sweat glands and other structures are clearly visible.
    17042-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17071-D.jpg
  • Leaf-stem of  Plantago major (Common Plantain) with several vascular bundles clearly visible.
    17102-D.jpg
  • Cardiac muscle cells is striated muscle cells found in the walls of the heart.
    17038-D.jpg
  • Sexual reproduction among two dinoflagellates (Diplopsalis sp.?), sample collected from a marine aquarium.
    17154-D.jpg
  • Marine Water Flea (Branchiopoda) from the genus Evadne, probably E. nordmanni. Just left of the flea is a copepod.
    17081-D.jpg
  • Vascular bundle from maize (Zea mays).
    17098-D.jpg
  • Flagellates from the genus Amphidinium collected from a marine aquarium. The cells are about 35x30 micrometer across.
    17180-D.jpg
  • Cross section through the spinal cord.
    17028-D.jpg
  • Diverse marine plancton sample from south-western Norway in August. Copepod naupli are numerous.
    17069-D.jpg
  • Vascular bundle in the leaf stem of Plantago major (Common Plantain).
    17100-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
  • Cyanobacteria from the genus Oscillatoria sampled from a marine aquarium.
    17139-D.jpg
  • Cyanobacteria from the genus Oscillatoria sampled from a marine aquarium.
    17140-D.jpg
  • Diverse marine plancton sample from south-western Norway in August.
    17074-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
  • 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
  • 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
  • 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
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Alf J. Nilsen Natural History images

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