1. Marine Biology Day 13 Sponges  Cnidarians
Drill: What is one stellar fact about sponges?
Outcome: Explain how simple looking organisms can be extremely complex

2. Reading: Spongebob, The Carnivore
Journal Write in your Notebooks
By what method do sponges normally get their food?
What type of food do sponges normally eat?
Where do carnivorous sponges live?
By what method do carnivorous sponges get their food?
What type of food do carnivorous sponges eat?
Why do carnivorous sponges not filter feed?

3. Marine Biology March 6, 2017 Phylum Cnidaria
Drill: Explain what a jellyfish looks like.
Outcome: Explain the four classes of Phylum Cnidaria and identify body plans in the form of a one pager

4. Cnidarians

5. Phylum Cnidaria : Body Plans
Polyp:
Sessile and benthic
Face upward
Medusa
Planktonic
Face downward

6. Phylum Cnidaria : 4 Classes
Class Hydrozoa:
Body Plan: Polyp
Info: Floating colony (PMoW)
Feeding
Reproduction
Gas Producing (PMoW)
Stinging (PMoW)
Info: Defense = Nematocysts
Stinging cells
Examples:
Portuguese Man of War
Hydra

7. PMoW Sting

8. Phylum Cnidaria : 4 Classes
Class Scyphozoa:
Body Plan: Medusa
Info: Poor Swimmers
Planktonic
Info: Can be Huge
Lions mane’s bell: 7-10ft and tentacles
200 to 230 ft long!
Info: Defense = Nematocysts
Stinging cells
Examples:
Lions Mane
Cassiopea (upside down jelly)

9. Phylum Cnidaria : 4 Classes
Class Cubozoa:
Body Plan: Medusa
Info: Strong Swimmers
Some have active fishlike behavior
Info: TRUE EYES
12 true eyes and 12 photoreceptive!
Info: Defense = Nematocysts
Stinging cells (5,000/tentacle)
Examples:
Irukandji
Box jellyfish

10. Phylum Cnidaria : 4 Classes
Class Anthozoa:
Body Plan: Polyp
Info: Sessile and benthic
Don’t normally move and on the sea floor
Can move for defense
Info: Various sizes
Anemone: 1/2 inch to 6ft
GBR: ~1429 miles (2300km)
Info: Defense = Nematocysts
Stinging cells
Info: Defense = Sweeper Tentacles or Mesenterial Filaments
Examples:
Sea anemone
Coral

11. Phylum Ctenophores – Comb Jellies
Lack stinging cells
Use sticky cells
Colloblasts
Bioluminescent
Planktonic

12. Cnidaria Defenses Corals and sea anemones
Coral Overtopping: One coral is growing over another to take advantage of available light and space.

13. Cnidaria Defenses Corals / Sea Anemones / Jellies
All Cnidarians have tentacles with stinging cells which they use to capture prey
Coiled inside is the stinger called a nematocyst

14. Cnidaria Defenses Coral Reefs
Sweeper Tentacles: Specialized cells called nematocysts sting or burn corals that are “too close”, which can eventually kill them!

15. Cnidaria Defenses Coral Reefs
Mesenterial Filaments: Hard coral can produce filaments from their stomachs that can kill or devour other coral polyps through a process similar to digestion.

16. One Pager on Cnidaria Complete a one pager on Phylum Cnidarian
It must include:
Phylum Cnidaria
Class Anthozoa / Class Hydrozoa / Class Cubozoa / Class Scyphozoa
Examples of each class
Which classes have polyp and medusa forms
Image of polyp and medusa form
Defenses for each class and explanation of defense
NEATNESS AND COLOR COUNT!!