I fished for earthworms when I was a child. Sometimes I use that three-toothed steel fork to plunge it into the soil and shake it a few times before the earthworm climbs out. Maybe it is feasible to start with "vibration".

Eggs are produced in the girdle, form cocoons after shedding, and develop directly. The setae are solitary, 8, sometimes many, arranged in a ring shape, with 1-2 pairs of testis, usually at10-1node, and a pair of male reproductive pores, which are located on two or more somites behind the posterior testis, namely/kloc-0. A pair of ovaries, located at 13, have thick bands and few yolk.

The body is segmented without division, the wart foot degenerates, and the body surface has bristles. Androgyny, with 1-2 pairs of gonads, a reproductive duct originating from the body cavity, and a reproductive belt on the body surface at sexual maturity, so they can inseminate each other during mating.

Earthworms have been identified by karyotype analysis in China. Chromosome 2n=22 of Eisenia foetida is exactly the same as that of artificially raised earthworms "Taiping II" and "Beixing II". ?

The body wall structure consists of cuticle, epidermal cells, annular muscle and longitudinal muscle, and the muscle layer is the body cavity membrane. There are well-developed glandular cells in epidermal cells, which can secrete mucus to moisten the skin and facilitate movement in the soil.