-Related to protostome linage
-Structurally acoelomate-small fluid filled sac-true
coelom
-Most are marine,but have some fresh water/damp soil
-Similiar excretory,sensory,& nervous syst. to
platyhelminthes
-Simple circulatory syst.
-Complete digestive track(seperate mouth & anus)
-No heart but muscle squeezes to propel blood
