An earthworms digestive system runs the length of its body. The openings near the clitellum are the genital setae.
Earthworm Anatomy And Dissection Guide Biology Junction
The anterior end is tapering while the posterior end is more or less blunt.
Earthworm external anatomy. Earthworm is elongated long narrow cylindrical or vermiform shaped. That is they do not have a backbone. The openings toward the anterior of the worm are the sperm ducts.
Start your dissection about an inch posterior to the clitellum. Lift up the skin with a pair of forceps and snip an opening with a pair of dissecting scissors. External morphology of earthworm.
Earthworm anatomy external features. Use dissection pins to secure each end on the tray. The very first section of the anterior contains the mouth and prostomium.
Earthworms are commonly called as farmers friend. What is the external anatomy of an earthworm. External anatomy of earthworm.
The skin of segments fourteenth fifteenth and sixteenth is swollen and pale in mature worms to form a saddle shaped structure called clitellum or cingulum. Large band of the earthworm close to anterior end secretes mucus for the cocoon that the eggs are in. Locate the clitellum which is on the anterior end of the worm.
Small long cylindrical animal without legs or hard body parts. They occur worldwide and are commonly found in soil eating live and dead organic matter. Insert the scissors into the opening and cut in a straight line all the way up through the mouth.
Body consists of dorsal and ventral surfaces. Pores to receive sperm from another worm during copulation and later to release that sperm for fertilization of the eggs. Part of the digestive tract of an earthworm just after its mouth.
Locate the mouth of the worm on the far anterior end of the worm. The external body of an earthworm is well adapted for living in the soil similar to the external structure of other insects. Every segment of the body excepting the clitellar and the first and last.
Study the illustration of an earthworm shown on the left. Insects sea stars spiders jellyfish and millipedes are other examples of invertebrate animals. Set of nerves in the abdomen of an earthworm.
Internal anatomy of an earthworm lateral section. The front or head of the worm is called the anterior. Entrance to the digestive tract of an earthworm.
The important external features are as follows. An earthworm with a well developed clitellum an earthworm is a tubular segmented worm of the phylum annelida. Lay the worm on your dissecting tray with its dorsal side facing up.
They are the common inhabitants of moist soil and feed on organic matter. Examine your earthworm and determine the dorsal and ventral sides. It secretes the material for producing cocoons.
The earthworms found in india are pheretima and lumbricus. You will notice that earthworms have long cylindrical body that is divided into similar segments. This is because the worm casting fecal deposit increases the fertility and burrowing help in proper aeration of the soil.
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