Earthworm External Anatomy

Locate the mouth of the worm on the far anterior end of the worm. Earthworms are commonly called as farmers friend.

Differences Between Squid And Earthworm Experiment

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.

Earthworm external anatomy. The earthworms found in india are pheretima and lumbricus. What is the external anatomy of an earthworm. The openings near the clitellum are the genital setae.

Insects sea stars spiders jellyfish and millipedes are other examples of invertebrate animals. Body consists of dorsal and ventral surfaces. Part of the digestive tract of an earthworm just after its mouth.

Study the illustration of an earthworm shown on the left. Earthworm is elongated long narrow cylindrical or vermiform shaped. Insert the scissors into the opening and cut in a straight line all the way up through the mouth.

Entrance to the digestive tract of an earthworm. The very first section of the anterior contains the mouth and prostomium. Every segment of the body excepting the clitellar and the first and last.

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. Internal anatomy of an earthworm lateral section.

Lift up the skin with a pair of forceps and snip an opening with a pair of dissecting scissors. Examine your earthworm and determine the dorsal and ventral sides. Earthworm anatomy external features.

Locate the clitellum which is on the anterior end of the worm. You will notice that earthworms have long cylindrical body that is divided into similar segments. It secretes the material for producing cocoons.

They are the common inhabitants of moist soil and feed on organic matter. That is they do not have a backbone. Lay the worm on your dissecting tray with its dorsal side facing up.

Use dissection pins to secure each end on the tray. Large band of the earthworm close to anterior end secretes mucus for the cocoon that the eggs are in. The external body of an earthworm is well adapted for living in the soil similar to the external structure of other insects.

External morphology of earthworm. The openings toward the anterior of the worm are the sperm ducts. An earthworm with a well developed clitellum an earthworm is a tubular segmented worm of the phylum annelida.

Start your dissection about an inch posterior to the clitellum. The anterior end is tapering while the posterior end is more or less blunt. External anatomy of earthworm.

The front or head of the worm is called the anterior. Set of nerves in the abdomen of an earthworm. 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. An earthworms digestive system runs the length of its body.

Earthworm General Characters External Morphology Setae