In this article we will discuss about the structure of Physalia with the help of a diagram. 1. It is a colonial sponge. The colony bears a transparent bluish or pinikish balloon-like large float or pneumatophore at the top. 2. The pneumatophore floats above the surface and the whole colony remains inside water. 3. A pair of gas glands are [...]
In this article we will discuss about the structure of Sea Pen (Pennatula) with the help of diagrams. 1. It is commonly known as "sea pen" and is found in the eastern coasts of North America. 2. The colour is usually red and the fully formed colony measures about 10 cm in height. 3. The colony is elongated, dimomorphic, [...]
In this article we will discuss about the structure of Aurelia with the help of a diagram. 1. It is a cosmopolitan jelly fish which is found in coastal waters. 2. The adults are exclusively medusoia forms. 3. The polyp is represented by schyphistoma and hydra tuba stages. 4. The body is like an inverted bowl or umbrella and is [...]