What phylum do flatworms belong to?
phylum Platyhelminthes
What are the 3 classes of phylum platyhelminthes?
The Platyhelminthes includes three classes: the Turbellaria (free-living flatworms), the Trematoda (flukes), and the Cestoda (tapeworms).
What are the four major classes of flatworms?
They lack circulatory and respiratory systems, and have a rudimentary excretory system. This digestive system is incomplete in most species. There are four traditional classes of flatworms, the largely free-living turbellarians, the ectoparasitic monogeneans, and the endoparasitic trematodes and cestodes.
What is the description of phylum platyhelminthes?
Characteristics of Platyhelminthes They are triploblastic, acoelomate, and bilaterally symmetrical. They may be free-living or parasites. The body has a soft covering with or without cilia. Their body is dorsoventrally flattened without any segments and appears like a leaf.
What are five characteristics of phylum platyhelminthes?
Characteristic features of Phylum Platyhelminthes
- Their body is dorsoventrally flattened.
- They exhibit bilateral symmetry.
- Also, they are triploblastic, with three germ layers.
- They do not have a body cavity and are acoelomate.
- The body is soft and unsegmented.
- They are mostly parasitic with a few free-living.
What do flatworms excrete?
Flatworms have an excretory system with a network of tubules throughout the body that open to the environment and nearby flame cells, whose cilia beat to direct waste fluids concentrated in the tubules out of the body. The system is responsible for regulation of dissolved salts and excretion of nitrogenous wastes.
Do planarians have kidneys?
discovered that the excretory system of planarian flatworms is a good model for normal and diseased human kidneys. The planarian protonephridia shares structural similarities with the subsegments of the vertebrate nephron, and both organisms use cilia-driven ultrafiltration and filtrate modification.
What is the function of Protonephridia?
The function of the protonephridia is the same as in most excretory organs: after ultra filtration a more or less selective resorption of substances from the lumen occurs. This reabsorption is supported by the large surface of the channel cell.
What is the purpose of the Nephridium where are they located?
Nephridium, unit of the excretory system in many primitive invertebrates and also in the amphioxus; it expels wastes from the body cavity to the (usually aquatic) exterior.