Earthworm

An earthworm is a soil-dwelling terrestrial invertebrate that belongs to the phylum Annelida. The term is the common name for the largest members of the class Oligochaeta. In classical systems, they were in the order of Opisthopora since the male pores opened posterior to the female pores, although the internal male segments are anterior to the female.

Theoretical cladistic studies have placed them in the suborder Lumbricina of the order Haplotaxida, but this may change.
Other slang names for earthworms include "dew-worm", "rainworm", "nightcrawler", and "angleworm".
Larger terrestrial earthworms are also called megadriles as opposed to the microdriles in the semiaquatic families Tubificidae, Lumbricidae and Enchytraeidae.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0