The document summarizes the phylum Coelenterata, which includes multicellular, radially symmetrical animals with needle cells. It describes three classes: Hydrozoa which have polyp and medusa forms like Obelia; Scyphozoa which are solitary marine medusoid forms like the four-chambered stomach jellyfish Aurelia; and Anthozoa which are marine polyp forms that can be solitary or colonial with septa in their gastrovascular cavity, including corals and sea anemones. It notes that corals form some of the most biodiverse ecosystems on Earth like the Great Barrier Reef.

1. COURSE I - FIRST SEMESTER
PHYLUM COELENTERATA
Needle cell bearing animals
Multicellular, radially symmetrical, diploblastic
Prof. S D Rathod

2. Needle cell

3. Stinging cell impact

4. Polymorphism

5. Class – Hydrozoa
 Polyp and medusa forms
 Example - Obelia

6. Class – Scyphozoa
 solitary and free living marine medusoid forms
 mesogloea is very thick which make them a jelly
like so jelly fishes
 Four chambered stomach
 Example - Aurelia

7. Aurelia (jelly fish)

8. Class – Anthozoa
• Anthozoans are marine polyp forms.
• They are solitary or colonial.
• gastrovascular cavity has vertical septa called as mesenteries.
 These are called corals
 Sea anemone

9. Corals
 Brain coral Sea fan Fungoid

10. Stag horn coral - Madrepora

11. Small polyps in corals

12. Coral reefs
Great barrier reef

13. Coral reef biodiversity
 Richest
biodive
rsity on
the
globe

14. Thank you