Earthworm Dissection PAP-Bio P.7 April 8, 2014

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Lumbricus Terrestris

Earthworms ( known as lob worm in Britain or dew worm in Canada) are an order of Haplotaxida. They belong to the kingdom Animalia under the phylum Annelida and sub-phylum oligochaeta. The earthworm is a tube-shaped, segmented animal commonly found living in soil. It feeds on live and dead organic matter. The word "earthworm" means nightcrawler in english. Its scientific name Lumricus means "worm" and terrestris meaning "earth." Earthworms burrow deep under the ground to feed on the soil to extract nutrients from them.


Students will learn about the internal and external anatomy of an earthworm. Students will focus on the internal organs, internal structures, and the functions of each external structure. Students will also understand the role of the earthworm.

Evolution of Earthworms

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Earthworm Dissection

Digestive System of an Earthworm

An Earthworm’s digestive system is one of the most important features of the worm. It consists of mouth, pharynx, esophagus, crop, gizzard and intestine. The mouth is surrounded by strong lips that act like a hand would. He searches for dead grass and bits and pieces of leaves and weeds. Once he finds food the lips break the food down into smaller pieces. Since an earthworm does not have teeth, bits of soil particles are used to help them “chew” their food.

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