The following points highlight the three main types of locomotion exhibited by protozoans. The types of locomotion are: 1. Amoeboid Movement 2. Flagellar Movement 3. Ciliary Movement. Protozoans: Type of Locomotion # 1. Amoeboid Movement: In Amoeba, movement of the animal is made by the throwing of pseudopodium (Fig. 10.60), called amoeboid movement. This is the most primitive kind of [...]
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 [...]