Annelida- The annelida are a large phylum or segmented worms. They have about 17,000 species. The annelids with blood vessils use methanephridia to remove soluble waste products. Most annelids have a two-stage filteration process. This process has two stages because it re-absorbs any reusable materials. These processes are very long and serious. They need to make sure they get rid of all the toxins in the body.
Polychaeate- These are a class of annelid worms. They have about 10,000 different species. They are sometimes referred to as bristle worms. They are robust and widespread. Also they live in the coldest climates. But some of their species are sometimes found in the hottest climates. This is a very rare occurence though. Their excretory system goes through a two stage process. Living as a worm they have many different toxins and diseases they interract with. There excretory system helps them to get rid of all of these toxins and live healthy lives.
Clitellata- This species is classified as clitellum. There is about 8,000 species. They have not fully developed heads. They have a similar way of reproduction as humans. They also have a very unique excretory system. Their excretory system consists of two pairs of nephridia. The anterior pair is opened and they dispose of their waste. This process is unlike most annelida species.
Haplodrili- This is a primitive marine worm. The body is a small and well developed. Their amount of species is unknown. This usually means that they do not have a large species. They usually live in sand and are found in tropical beaches. Their excretory systems are the same as polychaete. They use the two stage system. This system is used in almost all Annelida animals.