Hydra tentacle with nematocysts 1

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A retracted live green hydra (Phylum Cnidaria, class Hydrozoa, genus Hydra) tentacle (cnida) showing multiple nematocysts that were released from their cnidocytes.  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.    More than a dozen nematocysts are visible, but the two most obvious are at the upper-left of the tentacle.  Seen at approximately 400x magnification under a light microscope with no staining or artificial coloring.
A retracted live green hydra (Phylum Cnidaria, class Hydrozoa, genus Hydra) tentacle (cnida) showing multiple nematocysts that were released from their cnidocytes. 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. More than a dozen nematocysts are visible, but the two most obvious are at the upper-left of the tentacle. Seen at approximately 400x magnification...
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Keywords:
  • Cnidaria
  • Hydrozoa
  • Marc Perkins
  • OCC
  • animal
  • cnidocyte
  • green
  • hydra
  • live
  • microscope
  • nematocyst
  • slide
  • tentacle
  • zoology