Hydra tentacles with nematocysts

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Retracted live green hydra (Phylum Cnidaria, class Hydrozoa, genus Hydra) tentacles (cnidae) showing multiple nematocysts that are still embedded in the cnidocytes that formed them.  Nematocysts of this species have a bulb-shaped base that connects to a narrow barbed top, from which a long thin filament extends many times the length of the nematocyst's base.  In this image the nematocysts are all still embedded into the cnidocytes, clear cells lining the tentacle that produce nematocysts.  More than half a dozen nematocysts are visible, but the most obvious ones are at the upper-right of the topmost tentacle.  Seen at approximately 400x magnification under a light microscope with no staining or artificial coloring.
Retracted live green hydra (Phylum Cnidaria, class Hydrozoa, genus Hydra) tentacles (cnidae) showing multiple nematocysts that are still embedded in the cnidocytes that formed them. Nematocysts of this species have a bulb-shaped base that connects to a narrow barbed top, from which a long thin filament extends many times the length of the nematocyst's base. In this image the nematocysts are all still embedded into the cnidocytes, clear cells lining the tentacle that produce nematocysts....
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Keywords:
  • Cnidaria
  • Hydrozoa
  • Marc Perkins
  • OCC
  • animal
  • cnidocyte
  • green
  • hydra
  • live
  • microscope
  • nematocyst
  • slide
  • zoology