Earthworm External Anatomy

Entrance to the digestive tract of an earthworm. Earthworms are commonly called as farmers friend.

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They are the common inhabitants of moist soil and feed on organic matter.

Earthworm external anatomy. Locate the clitellum which is on the anterior end of the worm. An earthworm with a well developed clitellum an earthworm is a tubular segmented worm of the phylum annelida. Large band of the earthworm close to anterior end secretes mucus for the cocoon that the eggs are in.

This is because the worm casting fecal deposit increases the fertility and burrowing help in proper aeration of the soil. Pores to receive sperm from another worm during copulation and later to release that sperm for fertilization of the eggs. The important external features are as follows.

That is they do not have a backbone. Insert the scissors into the opening and cut in a straight line all the way up through the mouth. The very first section of the anterior contains the mouth and prostomium.

Insects sea stars spiders jellyfish and millipedes are other examples of invertebrate animals. What is the external anatomy of an earthworm. The earthworms found in india are pheretima and lumbricus.

Examine your earthworm and determine the dorsal and ventral sides. Start your dissection about an inch posterior to the clitellum. Part of the digestive tract of an earthworm just after its mouth.

Use dissection pins to secure each end on the tray. Earthworm is elongated long narrow cylindrical or vermiform shaped. Lift up the skin with a pair of forceps and snip an opening with a pair of dissecting scissors.

Set of nerves in the abdomen of an earthworm. The anterior end is tapering while the posterior end is more or less blunt. External anatomy of earthworm.

Study the illustration of an earthworm shown on the left. 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. Every segment of the body excepting the clitellar and the first and last.

Body consists of dorsal and ventral surfaces. External morphology of earthworm. The openings toward the anterior of the worm are the sperm ducts.

An earthworms digestive system runs the length of its body. Internal anatomy of an earthworm lateral section. The openings near the clitellum are the genital setae.

Earthworm anatomy external features. Locate the mouth of the worm on the far anterior end of the worm. The front or head of the worm is called the anterior.

Lay the worm on your dissecting tray with its dorsal side facing up. It secretes the material for producing cocoons. You will notice that earthworms have long cylindrical body that is divided into similar segments.

Small long cylindrical animal without legs or hard body parts. The external body of an earthworm is well adapted for living in the soil similar to the external structure of other insects. They occur worldwide and are commonly found in soil eating live and dead organic matter.

Internal Anatomy Earthworm Lateral Visual Dictionary