External Anatomy Earthworm

Instructions and guide to dissecting the earthworm which includes several images to supplement a laboratory experience. Study the illustration of an earthworm shown on the left.

Earthworm General Characters External Morphology Setae

The anterior end is tapering while the posterior end is more or less blunt.

External anatomy earthworm. That is they do not have a backbone. Large band of the earthworm close to anterior end secretes mucus for the cocoon that the eggs are in. Insects sea stars spiders jellyfish and millipedes are other examples of invertebrate animals.

It secretes the material for producing cocoons. Body consists of dorsal and ventral surfaces. A final analysis asks students to label a diagram of the worm.

Part of the digestive tract of an earthworm just after its mouth. 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. Set of nerves in the abdomen of an earthworm.

External and internal anatomy of an earthworm study guide by anurin includes 19 questions covering vocabulary terms and more. The external body of an earthworm is well adapted for living in the soil similar to the external structure of other insects. The front or head of the worm is called the anterior.

The important external features are as follows. Pores to receive sperm from another worm during copulation and later to release that sperm for fertilization of the eggs. Internal anatomy of an earthworm lateral section.

Small long cylindrical animal without legs or hard body parts. Earthworm is elongated long narrow cylindrical or vermiform shaped. Every segment of the body excepting the clitellar and the first and last.

External anatomy of earthworm. Underneath this cuticle a layer of the epidermis followed by two muscle layers and coelomic epithelium inner layer is sheathed. The very first section of the anterior contains the mouth and prostomium.

Locate the clitellum which is on the anterior end of the worm. Earthworm anatomy external features. Students start with the external anatomy locate structures and then use scissors to open the coelom of the worm.

Anatomy of earthworm externally a thin non cellular cuticle covers the body wall of the earthworm. Quizlet flashcards activities and games help you improve your grades. Locate the mouth of the worm on the far anterior end of the wormthe openings toward the anterior of the worm are the sperm ducts.

External morphology of earthworm. Examine your earthworm and determine the dorsal and ventral sides. You will notice that earthworms have long cylindrical body that is divided into similar segments.

The openings near the clitellum are the genital setae. Entrance to the digestive tract of an earthworm. What is the external anatomy of an earthworm.

Outside Of An Earthworm Science Learning Hub