Earthworm Dissection Lab

ANDRES SANCHEZ/ Pre-Ap Biology/ 7th period/ Guzman/

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Lumbricina, Terrestris (Earthworm)

An earthworm is a tube shaped, segmented animal found commonly living in soil. They feed on live and dead organic matter. It digestive system runs through the length of its body. It conducts respiration through its skin.


Earthworms have been called ‘ecosystem engineers’.

Much like human engineers, earthworms change the structure of their environments. Different types of earthworms can make both horizontal and vertical burrows, some of which can be very deep in soils.

These burrows create pores through which oxygen and water can enter and carbon dioxide can leave the soil.Earthworm faeces are also very important in soils and are responsible for some of the fine crumb structure of soils.

Objectives

Students will be learning the internal and external anatomy of an Earthworm. Students will be focusing on the organs, structures, and functions on the digestive system. Students will also understand the ecological role of the Earthworm.
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Earthworm Life Cycle

Earthworms can live for years and years as long as the climate and conditions are right. When they die, their body just becomes part of the compost in the soil.
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Earthworm Habitat

Earthworm are terrestrial creatures, because they mainly live in the soil. The best place to look for Earthworms are under stones or branches, because that is where most of the soil is moist. Earthworms aren't native to America, they actually originated in Europe, but began appearing in America when Europe first settled there.
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Predators

Earthworms have many predators that feast on them. Birds are the top predators for an earthworm. Robins are one of the many birds that feast on Earthworms.

Evolutionary Relationships of an Earthworm

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External Anatomy

External includes: Setae, Sperm grooves, Clitellum, Segments, Mouth, and Sperm duct openings.
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Digestive System

Digestive organs include: Mouth, Pharynx, Esophagus, Crop, Gizzard, Intestine, and Anus.

The gut of the earthworm is a straight tube which extends from the worm's mouth to its anus. It is differentiated into a buccal cavity (generally running through the first one or two segments of the earthworm), pharynx (running generally about four segments in length), esophagus, crop, gizzard and intestine

Invasion of the Non-native Earthworms cause harm to the forest