Lumbricus is the Chinese medicine name of earthworm, also called Kaibian Lumbricus or Guanglumbricus. Earthworms (earthworms) are common annelids that grow on land. It lives in the soil and usually comes out at night. It mainly feeds on livestock manure and organic waste, which is swallowed with the soil when it is eaten, and sometimes it eats small parts such as stems and leaves of plants. Earthworms can loosen soil, improve soil quality and promote high agricultural yield.

Distribution of Earthworms in Soil

Earthworms exist in most ecosystems in the world, but the ocean is the natural barrier of earthworms, and it is also rare in desert areas and snow-covered areas all year round. They are mainly distributed in the surface layer of soil rich in organic matter. Soil structure, pH value, water content and aeration are all factors that limit its distribution and quantity.

Characteristics of earthworm life:

1, like dark and humid places, like fertile soil.

2. I like quiet places and avoid noise.

3, like warm and cold, in the weather below 8 degrees, earthworms stop growing and developing.

Earthworms still like animals living alone, especially elders who don't like to get along with their children for a long time.

Physiological characteristics of earthworm:

1, afraid of strong light.

2, afraid of vibration, which is similar to earthworms like quiet.

3, afraid of water, earthworms can not soak in water for a long time.

4, afraid of spicy and other irritating things.

5, afraid of extreme weather, overheating and supercooling have a great influence on earthworms.

6. One of the most important characteristics of earthworms is hermaphroditism and heterofertilization.

External characteristics of earthworms:

1, the body is cylindrical, symmetrical on both sides and chain-like.

2. Earthworms have no bones and belong to invertebrates, with bare body surface and no cuticle.

3. Colors are brown, khaki and dark brown.