Earthworms are divided into 23 families, more than 700 genera, and more than 7,000 species.
There are more than 4400 different species of earthworms known to man. Researchers have broken them down into 3 catagories, of which are based on their habits in the soil. Endogeic worms build tunnels throughout the upper layer of soil, and rarely come to the surface. They eat significant amounts of soil, and less organic material. Anecic worms build vertical burrows that go down to depths up to 6 feet deep. They decay surface matter. Epigic worms are used in composting. They prefer environments that mainly contain organic matter and are poor burrowers.
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