Earthworm (Lumbricus terrestris), coloured scanning electron micrograph (SEM). Its segmented body is clearly seen. Spikes on the body aid movement. This is an annelid worm that inhabits soils, feeding on organic material. Earthworms are highly beneficial to soils. Their movement aerates the soil and their feeding and excretion recycle nutrients and minerals. Magnification: x40 when printed at 10 centimetres wide.