The Lumbriculus variegatus (Lumbriculus spp) is commonly known as Lumbricus common. It has small dimension and is considered like an aquatics relative about earthworms. Although the name is a bit misleading the Lumbriculus variegatus is actually included in a separate order (Lumbriculidae) of Oligochaeta, in a nutshell they are annelid worms like earthworms, but different from them. 

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