<P> An adult earthworm develops a belt - like glandular swelling , called the clitellum , which covers several segments toward the front part of the animal . This is part of the reproductive system and produces egg capsules . The posterior is most commonly cylindrical like the rest of the body , but depending on the species , may also be quadrangular , octagonal , trapezoidal , or flattened . The last segment is called the periproct ; the earthworm 's anus , a short vertical slit , is found on this segment . </P>
what is the last segment of earthworm called and what organ does it contain
periproct anus