In this article we will discuss about Aurelia:- 1. Structure of Aurelia 2. Sense Organs of Aurelia 3. Histology 4. Life History. Structure of Aurelia: Adult Aurelia represents medusoid stage. It has the typical form of a medusa (Fig. 12.18). But the concave and convex sides of the umbrella are more pronounced. The edge of the umbrella is provided with [...]
In this article we will discuss about the histological organisation of Cnidarians. 1. Ectoderm: In most cases it is distinctly cellular. Presence of ciliated ectoderm in larval cnidarians is usually seen. The cellular ectoderm is mainly composed of the supporting cells, called the Epitheliomuscular cells. They are usually cuboidal or columnar in shape. They may be thin and flattened (exumbrellar [...]
In this article we will discuss about Coral Reefs:- 1. Definition of Coral Reef 2. Biome of Coral Reef 3. Reef Building Corals and Other Organisms 4. Conditions for Formation 5. Fossil Corals and Reefs of the Geologic Past 6. Types 7. Theories regarding Formation 8. Distribution 9. Role of Symbionts 10. Genera of Reef Building Corals in India 11. [...]