Earthworm Dissection Lab
ANDRES SANCHEZ/ Pre-Ap Biology/ 7th period/ Guzman/
Lumbricina, Terrestris (Earthworm)
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.
Earthworm Life Cycle
Evolutionary Relationships of an Earthworm
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