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Cnidarians By Siobhan Curtis. What is a Cnidarian?  Greek from the word “Knide” meaning “Nettle” because they can sting.  10,000 Different species found.

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Presentation on theme: "Cnidarians By Siobhan Curtis. What is a Cnidarian?  Greek from the word “Knide” meaning “Nettle” because they can sting.  10,000 Different species found."— Presentation transcript:

1 Cnidarians By Siobhan Curtis

2 What is a Cnidarian?  Greek from the word “Knide” meaning “Nettle” because they can sting.  10,000 Different species found in aquatic and mostly marine environments.

3 Description:  2 basic types:  Swimming Medusae ( free swimming sexual form)  Sessile polyps  Both body types are radially symmetrical With mouths surrounded by tentacles.  Bodies consist of mesoglea (a non living jelly like Substance) sandwiched between two layers of Epithelium that are 1 cell thick.

4 Life History  Generally occupy open marine water.  Feed on Plankton( heavy factors in which to keep the plankton population in control.), Small Crustaceans, Fish eggs, Fish, and other Jelly fish.  Although they are preyed on by: Tuna, Sharks, Sea Turtles, Swordfish, and Salmon  Jellyfish are plankton, so they are important for keeping balance in the aquatic ecosystem.

5 LIFE CYCLE YAY!!!!!!!  FERTILIZED EGG >PLANULA LARVA ( a free swimming coelenterate larva with a flattened, ciliated, solid body) >POLYP>POLYP TRANSFORMING>YOUNG MESDUSA> JELLY LIKE MESOGLEA  During their life cycle they experience alterations of generations.  EX: The Medusae reproduces sexually and the polyp reproduces asexually.

6 More Sexy Time: 1. Male Medusae release sperm from their mouth opening located on the underside of the bell.

7 PUGET SOUND HAS JELLIES WHAT!!!!!!! Puget sound was so abundant with jellies in 2003 it filled % of all biomass.

8 Sources  'https://www.google.com/ 


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