That’s called the clitellum and it secretes the cocoon that encloses the earthworm’s eggs. read more
The primary function of the clitellum is to create a cocoon for the developing young of the annelids that possess them. The most well-known species which have a clitellum are earthworms and leeches, on which the clitellum appears as a pale saddle-like structure a few segments down from their mouths. read more
An earthworm is an invertebrate animal with a long, stretchy body and no legs. It is a type of annelid. read more