The Platyhelminthes phylum, or also known as flatworms are invertebrate animals that comprise of over 20,000 different species. They are soft bodied creatures with no body cavity and lack in digestive and circulatory structure. Because of this flatworms instead absorb nutrients through their skin and excrete wastes using specialized "flame cells." Within the Platyhelminthes phylum are free-living and parasitic species. They can move around by using layers of muscles or by gliding along a slime trail using cilia. The urinary system of Platyhelminthes is composed of small tube-like structures that flow through the mesoderm of the Platyhelminth. Within these tubes, flagella direct the movement of digestive fluid, water and waste.
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Cestoda-
Digenea's urinary sytem is very similar to the one of the Cestoda. Although Digenea will try and balance the content of it's water. Because it is in an osmotic enviroment, excess water often enters, and must be forced out through excretion out of the proglottids.
Digenea's urinary sytem is very similar to the one of the Cestoda. Although Digenea will try and balance the content of it's water. Because it is in an osmotic enviroment, excess water often enters, and must be forced out through excretion out of the proglottids.
![Picture](/uploads/2/9/0/6/29068025/6981126.jpeg?348)
Digenea-
The small tube-like structures in the urinary system of Digenea end in flame cells, which propel the waste to a posterior bladder. This bladder then excretes the waste through an excretory pore. Different from other Platyhelminthes urinary systems Dignenea does not remove it's water contents. Instead, it excretes a part of the physical waste of the food as well.
The small tube-like structures in the urinary system of Digenea end in flame cells, which propel the waste to a posterior bladder. This bladder then excretes the waste through an excretory pore. Different from other Platyhelminthes urinary systems Dignenea does not remove it's water contents. Instead, it excretes a part of the physical waste of the food as well.
![Picture](/uploads/2/9/0/6/29068025/8810877.jpg?376)
Trematoda-
Most of the Trematoda phylum is very parasitic. To excrete waste, members of Trematoda use two kidney-like structures known as nephridiums which then filters waste into a bladder. Waste exits the bladder to be excreted from the pores on the end of the animal by metenaphrida.
Most of the Trematoda phylum is very parasitic. To excrete waste, members of Trematoda use two kidney-like structures known as nephridiums which then filters waste into a bladder. Waste exits the bladder to be excreted from the pores on the end of the animal by metenaphrida.