All About Earthworms

Virginia Sanchez - Period 4 - PAP Biology - Guzman

Dirt Deep Information About Earthworms

The Lumbricus terrestris, more commonly known as the earthworm, is a member of the phylum Annelida. These wiggly creatures grow up to 14, but are usually about the size of a tea cup. They can live up to 6 years! Although living in dirt seems simple and plain, where an earthworm lives depends on vegetation and climate. Most of the time the dirt is moist and cool. An earthworms ecological niche in their environment is generally decomposing the soil. Predators include humans, snakes, birds, chipmunks, rats, and a large variety of insects. Earthworms have adapted to their environment by their setae, which help them move around in the dirt.

Taxonomy

•Kingdom: Animalia

•Phylum: Annelida

•Class: Clitellata

•Order: Haplotaxida

•Family: Lambricicdae

•Genus: Lumbricus

•Species: Terrestris

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Objectives

Our objective is to learn about the external and internal anatomy, and general information about the earthworm. The main focus is learning about the organs and functions of the digestive system.

The Digestive System

The digestive system consists of the mouth, pharynx, esophagus, crop, gizzard, intestine, and anus. The earthworm eats his food by using his mouth, and the pharynx and esophagus lubricate and lead the food to the crop. The crop stores the food as it moves through the digestive system. The food is mixed together and is then pushed into the gizzard where the real digestion begins. The gizzard begins to grind and break apart food, using enzymes that are secreted from the walls. The intestine then transports nutrients through the digestive system, and continues the waste til the anus excretes the waste and it exits the body.

Check Out This Super Cool Earthworm Dissection!