Nematoda
Nematoda are also known as Roundworms. Nematoda do not have cardiovascular systems. Nematodes do not possess a defined circulatory system as their pseudocoel fluids accomplish circulation. The species in this phylum obtain a pseudocoelom, which is basically the body cavity of any multicellular organism filled with superfluous amount of fluids, and also transports the specific nutrients, oxygen, and more. The Nematodes do not obtain a circulatory system and are able to transfer the oxygen and the necessary nutrients for themselves by diffusion.
These animals do not have cardiovascular systems.
Clam Worm- Clam worms feed on algae and other invertebrates that they find by burrowing in the sand or mud.
Hook Worm- Hook worm's use diffusion to breathe and for circulation of substances around there body.
Helicotylenchus dihystera- It is a plant pathogenic nematode. It is known to inhabit sugarcane, rice, potatoes, corn, peanut, millet, sorghum, forest trees, and banana.
These animals do not have cardiovascular systems.
Clam Worm- Clam worms feed on algae and other invertebrates that they find by burrowing in the sand or mud.
Hook Worm- Hook worm's use diffusion to breathe and for circulation of substances around there body.
Helicotylenchus dihystera- It is a plant pathogenic nematode. It is known to inhabit sugarcane, rice, potatoes, corn, peanut, millet, sorghum, forest trees, and banana.