How to identify: the Lob worm (aka common earthworm) Tags: Lob wormcommon earthwormearthwormsidentificationBritain's largest earthworm, also known as the common earthworm. Scientific name Lumbricus terrestris Distribution Very common and widespread. Can reach populations of 20 to 40 worms per square metre in an average garden lawn Tweet Read more about How to identify: the Lob worm (aka common earthworm)