Dugesia saggita (planarian flatworm)The Dugesia saggita (also known as the Planaria saggita) is from the Turbellaria class, and inhabits in the rivers of Corfu, Greece. It is 10 mm long and 3 mm wide. The opening for the digestive system is the same place for excreting wastes. The flame cells are responsible for excreting all wastes. Inside of the flame cell is a hollow cavity with a tuft of cilia inside. The wastes enter the cell, diffuse through the cavity, and are forced into an excretory tube by the beating of the cilia. The excretory tube leads to the body opening where all types of wastes are excreted.
|
Taenia saginata (tapeworm)The Taenia saginata is commonly known as the tapeworm and is part of the Cestoda class. It is a parasitic flatworm that lives in the digestive tracts of vertebrates, specifically humans and cattle, and is typically 4 to 10 m long. Like other flatworms, it also excretes waste using flame cells, found in its proglottids, or the segments of its body containing reproductive organs. All of its wastes are excreted the same way through one opening in their body through the flame cells.
|
Diplozoon paradoxum (parasitic flatworm)This species is part of the Monogenea class and is commonly found on the gills of freshwater fish in Asia and Europe. It is usually about 0.7 cm and has several hooks in its mouth that attach onto the fish. They are hermaphroditic and therefore have both male and female reproductive systems. They have very simple organs, and similarly to the other flatworms have only one opening in their body. Therefore, wastes are excreted in the same place that food enters. They also use flame cells in order to help them push the waste out of their bodies.
|