Cnidarians Alexis
Upcoming SlideShare
Loading in...5

Like this? Share it with your network

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads


Total Views
On Slideshare
From Embeds
Number of Embeds



Embeds 1 1

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

    No notes for slide


  • 1. Cnidarians By Alexis Hodges
  • 2. What is a Cnidarian?
    • Are soft bodied, carnivorous animals that have stinging tentacles arranged in circles around their mouths. They are the simplest animals to have body symmetry and specialized tissues.
    • Get there names from the Cnidocytes, or stinging cells, that are located along their tentacles.
  • 3. Body Plan
    • Cnidarians typically have a life cycle that includes two-different stages; a polyp and a medusa.
    • A polyp is a cylindrical body with arm like tentacles.
    • A medusa has a motile, bell-shaped body with the mouth on the bottom.
    • Each have a body wall that surrounds an internal space called a Gastrovascular cavity.
  • 4. Feeding
    • After a Cnidarian paralyzes its prey, it pulls the prey through its mouth and into the gastrovascular cavity. Which is a digestive chamber with one opening.
  • 5. Respiration, Circulation, & Excretion
    • The nutrients are usually transported throughout the body by diffusion.
    • Cnidarians respire and eliminate the wastes of cellular metabolism by diffusion through their body walls.
  • 6. Response
    • Cnidarians gather information from their environment using specialized sensory cells.
    • Nerve net - is a loosely organized network of nerve cells that together allow cnidarians to detect stimuli such as the touch of a foreign object.
  • 7. Movement
    • Different Cnidarians move in different ways.
    • Some Cnidarians , such as sea anemones, have a hydrostatic skeleton.
    • Which consists of layer of circular muscles and a layer of longitudinal muscles that, together with the water in the gastrovascular cavity, enable the cnidarians to move.
  • 8. Reproduction
    • Reproduce both asexually and sexually.
    • With most cnidarians , sexual reproduction takes place with external fertilization in water.
    • Which takes place outside of the females body.