What characteristics are used to identify the earthworms?

Explanation

1. In gardens, they can be traced by their faecal deposits known as worm castings on the soil surface. Earthworms are considered as "Friends of Farmers".
2. Earthworms are also conveniently classified based on their ecological strategies as epigeics, anecies and endogeics.
a. Epigeics (Greek for "up on the carth") are surface dwellers. Eg: Perionyx excavatus.
b. Anecics (Greek for "out of the earth") are found in upper layers of the soil. Eg: Lampito mauritii.
c. Endogeics (Greek for "within the earth") are found in deeper layers of the soil. Eg: Octochaetona thurstoni.