Question

What is the first segment in the body of an earthworm called?

Answer 1

Earthworm:

1. These are bilaterally symmetrical and belong to the phylum Annelida.

Peristomium :

1. Peristomium is the first segment in the body of an earthworm or buccal segment which bears the crescentic mouth .
2. It helps the annelids body to be pushed into the soil.
3. It contains the mouth, above mouth prostomium is present and it is used to feel outside environment as it has no eyes, nose or ears.