Earthworms have no limbs but the setae are almost like little legs that help it slide through the soil. The earthworm brain is actually a fused pair of nerve ganglia, mostly located in the third segment. 1. When an earthworm has mated, the clitellum will secrete a sack of eggs. There are three giant nerve fibres that run the length of the body, around the gut. In mature worms a thick collar or girdle-like glandular thickening of body wall called clitellum is present around segments 14, 15 and 16. The dorsal side is characterized by a dark line of blood vessels and ventral side is characterized by the genital openings. Each segment has a number of setae or very small bristles that earthworms use to help them grip the soil as they move. Each worm has five aortic arches, or hearts, which pump blood between dorsal and ventral blood vessels. Morphology of Earthworm. The body is divided into small segments. Each segment from about segment 5 bears one pair of ventral pores, called nephridiopores, which open into the nephridia, which are the earthworm Some species of earthworms have a body composed of over 100 segments. On mature earthworms, you will find a saddle or glandular ring called a clitellum. Some species of earthworms have a dark-red or red-violet body while other species are muddy-green. An earthworm does not have a skeleton. You will notice that earthworms have long, cylindrical body that is divided into similar segments. Annelida in Latin means, “little rings.” The body of the earthworm is segmented which looks like many little rings joined or fused together. It is reddish brown colour segmented worm like organism. The bristles along the body of an earthworm are called the Setae,which are set along its segmented length. There are four pairs of setae in each segment of a worm’s body. Segmented body. They normally reside at the upper layer of the moist soil. The sexual organs are located around segments 9-15 of the worm. The bristles along the body of an earthworm are called the Setae,which are set along its segmented length. Earthworm is a reddish-brown terrestrial without backbone or spine. The earthworms are cylindrical in shape. The length of an adult earthworm ranges from 10 mm to 3m. It conducts respiration through its skin. An earthworm's digestive system runs through the length of its body. The ovaries and oviducts are located in segments 13, which they release their eggs through their female pores in segment … The earthworm is made of about 100-150 segments. Apart from the mouth and anus there are numerous openings on the worm's body. The earthworm’s body is divided into segments. Each segment has a number of bristly hairs attached to it, which helps the earthworm to move around. One of the species named, Lumbricus terrestris can grow to length of about 360 mm. These fibres transmit impulses from the brain which control rapid body movements. There are Grooves that separates the segments of its body. Earthworms have a tube-like arrangement or cylindrical shaped and reddish-brown segmented body. In all the body segments except the first, last and clitellum, there is a ring of S-shaped setae embedded in the epidermal pit of each segment. The length of a worms body has muscles which contract and relax which enables the worm to move along a surface. They have a world-wide distribution and are commonly found living in soil, feeding on live and dead organic matter. It has bristles on each segment called setae (see-tee) that help the earthworm move. Correct answer is b)Earthworm has around 100-120 segments. Circular muscles loop around each segment, and longitudinal muscles run along the length of the body. The clitellum is a swelling of the skin and can only be … Worm Anatomy. An earthworm moves by using two different sets of muscles. The body is separated in segments which resemble rings. In all the body segments except the first, last and clitellum, there is a ring of S-shaped setae embedded in the epidermal pit of each segment. Pheretima and Lumbricus are the common Indian earthworms. These lengths are entirely depends upon the species. At the anterior position of the body earth worm consists of a tubular and glandular non segmented structure called clitellum. The round segment on the body of earth worm is called clitellum. Tapering tail. During breeding season, it forms cocoon in … Body Colours One of the key features of an earthworm is the colour of its body. In the gardens, they can be identified by their fecal discharges.