In a short time, the elasticity of its wall closes up its two ends forming a cocoon or ootheca. Reproductive System of Earthworm Anatomy of Earthworm,Cockroach & Frog of Class 11. During reproduction, two worms come together in opposite directions with their clitellums in contact with segments 9-11 of their mating partner. A pair of white, small, lobulated ovaries. Sperm are stored in a seminal vesicle and eggs in an egg sac, rather than in the coelom. 10. The worm’s excretory organs are tiny nephridia. These glands are exposed to outside by a collection of small ductless glands. These are found in two pairs and each pair is located on the either side of the alimentary canal. They lie ventro-laterally below the alimentary canal, close to mid-ventral line on either side of ventral nerve cord. The female reproductive organs consist of ovaries, oviducts, and spermathecae. Albumen cells provides nutrition to the embryo. REPRODUCTIVE SYSTEM OF EARTHWORM. Spermathecae are four pairs and each pair is located ventro-laterally in the 6. The sac is white, with wide walls and is filled with fluid. Let us first analyse the male reproductive system. Earthworm’s male reproductive system consists of two pairs of the testis, two pairs of spermiducal funnel, two pairs of seminal vesicles, two pairs of vasdefence, one pair of prostatic gland and one pair of the common prosthetic prostatic spermatic duct and one pair of male genital aperture. Reproduction in Earthworm. Earthworms have no larval stage; a young worm emerges from these cocoons, fully formed. Vedantu academic counsellor will be calling you shortly for your Online Counselling session. Reproductive System. Each spermathecum is made of ampulla and neck (upper short tubular part). The clitellum produces a mucus which holds the two worms together for sperm exchange. Earthworms are hermaphrodites or monoecious i.e. The common earthworm, Lumbricus terrestris, is a cylindrical, segmented and tubular worm which plays an important part in maintaining the ecosystem. The ganglia above the pharynx serve as the brain of the earthworm. It has both male and female reproductive organs in the same individual. The crop-gizzard is also partially obscured by the cream-coloured seminal vesicles of the reproductive system. Unlike most organ systems, the sexes of differentiated species often have significant differences. They are cup like curvature in structure and are present in two pairs. As advanced students of biology, you must study further on sexual and sexual types of reproduction. Female Reproductive System. Seventeen native species and 13 introduced species (from Europe) occur in the eastern United States, L. terrestris being the most common. These are found in two pairs, each pair is located in 11. Each earthworm has 4 pairs of spermatheca. Prostate glands are large, whitish, flat solid, irregularly shaped glands. This is the area where sperm is stored. These are mature sperms; producing them is the main function of testes in earthworms. The prostatic duct is connected to the two vasa deferntia of its own side and forms a common prostatic and spermatic duct. They are thin-walled and fluid-filled sacs. The worm’s excretory organs are tiny nephridia. These are found in pair and are located one on either side of the alimentary canal in the segments from 16. Each ovary is whitish in colour and consists of ovarian tubules. The testis sacs links with a pair of seminal vesicles. That is, they each have a set of female and male organs. A pair of white, small, lobulated ovaries. The male reproductive organs comprises of testes, testis sacs, seminal vesicles, spermiducal funnel, vasa deferentia, prostate glands and accessory glands. However, only one develops into embryo, while other fertilized eggs serve nutritive/ nurse cells. Known for their iteroparous nature, earthworms also never stop growing. The circulatory system of earthworm is closed type that is made up of blood vessels and capillaries that are fork out all over the body. A mature worm exits a cocoon after some time. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. Finally, the girdle is removed off from the anterior end of the worm. These are located at the 10. segments. These produce spermatogonia. Experts state that seminal vesicles of earthworms evolved nearly 1 million years ago and precedes parthenogenesis. 11. Q: What do you mean by sensory nerves? The spermatogonia mature in these vesicles and develop into spermatozoa. Copulation has been seen in several species of earthworms. Earthworms have both male and female reproductive organs, but does not fertilize itself. However, self-fertilization doesn’t occur because of relative location of male and female reproductive organs as well as it is protandrous. Then they are discharged through the male genital apertures along with the prostate glands’ secretion. 2. explain how earthworms demestrates cephalization 3. Earthworms are simultaneous hermaphrodites, and hence reproduction involves both copulation and cross-fertilisation. Two of these oviducts meet at the 14. segment and then open out into the external genital pore. Each testis consists of 4-8 fingers like projections and are situated inside testis sac. The clitellum secretes mucus that picks up the egg and sperm cell forming a cocoon. Clitellum is the most important feature of reproduction in earthworm. A task for you: Identify the various segments of these worms in your school’s laboratory. Male Reproductive System. 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