A genus of annelids, belonging to the Oligochæta, and including the common earthworms. See Earthworm.

n. Phylum Annelida, Class Oligochaeta Segmented annelids, also called earthworms or angleworms, that live in soil and play a key role in aerating the ground.

Lumbricus contains some of the most commonly seen species of earthworms. Lumbricus has four different species which are Lumbricus rubellus,Lubricus castaneus, Lumbricus terrestris, and Lumbricus festivus. There are some major differences between these four species of earthworms.