Excretory System of Nephridia (Earthworm)! These are of three types according to their location in the body: 1. Septal nephridia; 2. Integumentary nephridia 3. Pharyngeal nephridia. 1. Septal Nephridia: These are found situated on the inter-segmental septum between 15th and 16th segments to the posterior side of the body. Each septum bears nephridia on both the surfaces arranged in semicircles [...]
Economic Importance of Earthworm! Useful Affairs of Earthworms: The earthworms are better known as the friend of farmers due to the following reasons: 1. The earthworms improve the fertility of soil in different ways and, therefore, they are of utmost importance in agriculture. Actually, the burrowing and soil feeding habits of earthworms make the soil porous which permit both aeration [...]
Reproductive System of Pheretima (Earthworm)! Male Reproductive Organs of Earthworm: The male reproductive organs consist of testes, testis sacs, seminal vesicles, vasa deferentia, prostate glands and accessory glands. Testes and Testis Sacs: The testes are two pairs, very minute, whitish and lobed structures situated one pair each in segment 10th and 11th found attached with the posterior surface of 9/10 [...]