Annelida
In all Annelids the excretory system uses a two-stage
filtration process during which waste materials and fluids are extracted and
then filtered again to consume left over re-usable substances while deposing of
toxic and drained materials as urine. Members of the Annelida phylum could be
capable of using one of two different methods to remove soluble waste products.
The excretory system in the organisms included in this phylum with blood
vessels relies on metanephridia, while the organisms without blood vessels
carry out the excretory system using protonephridia.