The star fish has a very convoluted excretory system. It is convoluted in how simplistic it is. It is so simplistic that it is complicated to understand how simplistic one organism could excrete so simplistically. The start fish has no excretory organs. They have a water-vascular system that is made up of cells devoted to taking in waste and passing it along through tiny openings. They pass it along to an area known for star fish as the tube feet that put out excretion in the form of nitrogenous waste (urine).