Oral groove: The ventral surface of the body of this protozoan bears a prominent, oblique and shallow depression. The two alveolar membranes enclose a series of alveolar spaces or cavities in between them. Second and third layers of the pellicle are called as outer alveolar and inner alveolar membranes. The outermost layer is called as cell membrane. A cilium comes out through the center of each depression.Īccording to the electron microscopic studies, pellicle is composed of three layers. The marginal hexagonal depressions are slightly raised up as ridges. Pellicle contains large number of small polygonal or hexagonal depressions or ciliary fields. The firm pellicle provides definite and constant shape to this protozoan and also allows bending movements. Pellicle: The body of this protozoan is covered externally by a colorless, thin, firm and elastic cuticular membrane called as pellicle. Ventral or oral surface is flat and the dorsal or aboral surface is convex. The anterior end is rounded and the posterior end is cone-shaped. Shape: It is elongated, slipper-shaped animal and is commonly called as slipper animalcule due to its shape. The greatest diameter of the cylindrical body is about two-thirds of its entire length. It is visible to naked eye as whitish or grayish spot. The largest species of this genus is Paramecium caudatum and it measures about 170-290 µ. Size: Paramecium is a unicellular microscopic protozoan. It is commonly called as slipper animalcule due to its shape which is like slipper. It is found in abundance in stagnant water bodies containing dead and decaying organic matter. It is found in fresh water ponds, pools, streams, lakes, rivers etc. PARAMECIUM GENERAL CHARACTERS Distribution
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