Module 4: Invertebrates – Part 2

October 14, 2014 PowerPoint  Honors Marine Biology Module 4 Corals

Class Anthozoa represents the largest group of cnidarians. Corals and Sea Anemones – These organisms have a more complex structure than the hydrozoans or scyphozoans. Their gastrovascular cavity is lined with vertical partitions called Septa that provide greater surface area for digestion.

Living in the warm waters of the world, most corals are made up of colonies of individuals with layers of ectodermal cells that secrete protective walls of calcium carbonate into which the polyps can hide when threatened.

Observation of coral



Students observed many different types of corals in class.





What makes many corals different from other anthozoans?  They have cup-like walls around each polyp.  These polyps remained attached to each one another after budding.  This forms the coral reef. Reef building corals grow faster than other corals because they have the help of symbiotic dinoflagellates called zooxanthellae.


  • Finish OYO and Study guide questions for Module 4
  • Take Module 4 Test
  • Read Module 5 pages: 97 – 107
  • Finish up Experiment 4.B: Observation of Corals
  • Quiz: Define and give examples of Mutualism, commensalism and parasitism (page 89)
  • Class challenge: Share your favorite impersonation

Next week we will be dissecting a squid in class.  If you have a dissecting kit and tools, bring it to class.  We will have dissection supplies to share.  I will supply surgical gloves.

Have a good week. – Mrs. S

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