Earthworm Dissection-PAP Bio-Ms.Vu
Earthworms are members of the phylum Annelida. They also fall under the class Oligochaeta and subclass Haplotaxida. There are over 3,000 species of earthworms around the world. These invertebrates range in color from brown to to red, and most have a soft body. Earthworms range in size from a few inches long to over 22 feet long. The largest earthworms live in South Africa and Australia.
In this lab, students will observe the external and internal structures of the earthworm. They will also focus on the structures and function of its digestive system.
The earthworm is most numerous in grasslands, including garden lawns, and is not adversely affected by cultivation.
Animals such as snakes and birds feed on earthworms. Any insects are also predators of the earthworm.
Earthworm Life Cycle
Earthworm Dissection Tutorial
Earthworm Dissection Lab
Clitellum, Setae, Sperm duct, Oviduct, Seminal Receptacle, Mouth, Prostomium, Anterior End, Anus, Posterior End, Segments
Mouth, Pharynx, Esophagus, Crop, Gizzard, Intestine
Heart and Dorsal (and ventral) blood vessel, hearts, mouth
Earthworm Circulatory System
The earthworm has a closed circulatory system. There are three main vessels that supply the blood to organs within the earthworm. These vessels are the aortic arches, dorsal blood vessels, and ventral blood vessels. The aortic arches function like a human heart.The dorsal blood vessels are responsible for carrying blood to the front of the earthworm’s body. The ventral blood vessels are responsible for carrying blood to the back of the earthworm’s body.