The Soybean Cyst Nematode is a nematode known as being a major parasite toward soybeans. It causes about 500 million dollars worth of damage in the United States alone, and has reduced yields by 75 percent in some cases.
It's cardiovascular system (and that of all nematodes)
The Soybean Cyst Nematode does not have a true circulatory system. Instead, their bodies contain a pseudocoelom, which is a body cavity located between their epidermises and gut cavity that contains fluid that transports nutrients. From there, they use diffusion to circulate substances around it's body.