These are free-living organisms found mostly in fresh water.
The life cycle is complicated with one or more larval stages.The flame cells help in excretion and osmoregulation.The nervous system comprises the brain and two longitudinal nerve cords arranged in a ladder-like fashion.Some of the characteristics that distinguish the organisms belonging to phylum Platyhelminthes from others are:The classification of Platyhelminthes are given below:These are free-living organisms found mostly in fresh water.A few organisms belonging to these species cause severe diseases such as Schistosomiasis, or snail fever. They live as parasites in the small intestine of human beings and their larva are found in the muscles of the pigs. The epidermal tissue is a single layer cells or a layer of fused cells (syncytium) that covers a layer of circular muscle above a layer of longitudinal muscle. It shows well-marked sexual dimorphism.Schistosoma causes Schistosomiasis which spreads through contaminated water. In this, the liver of the animal enlarges and the bile ducts are blocked.
It is one of the most dangerous diseases in tropical countries. These are acoelomates and they include many free-living and parasitic life forms.Members of this phylum range in size from a single-celled organism to around 2-3 feet long.Platyhelminthes have the following important characteristics:They are triploblastic, acoelomate, and bilaterally symmetrical.The body has a soft covering with or without cilia.Their body is dorsoventrally flattened without any segments and appears like a leaf.They are devoid of the anus and circulatory system but has a mouth.They respire by simple diffusion through the body surface.The space between the body wall and organs is filled with connective tissue parenchyma which helps in transporting the food material.They are hermaphrodites, i.e., both male and female organs are present in the same body.They reproduce sexually by fusion of gametes and asexually by regeneration by fission and regeneration. This phylum includes about 20,000 species.
Tegument /ˈtɛɡjəmənt/ is a term in helminthology for the outer body covering of members of the phylum Platyhelminthes. This phylum includes 13,000 species. Classification of Platyhelminthes Turbellaria. It forms the protective layer and the host-parasiteint… Body plan Outer Body Covering • The body of some Platyhelminthes (e.g., turbellarians ) is covered by a ciliated epidermis • Epidermal cells contain rod-shaped structures called rhabdites that when released into the surrounding water, expand and form a … These are mostly parasitic. The organisms are also known as flatworms. The fine structure of tegument is essentially the same in both the The external surface of tegument is associated with unique defining structures in cestodes and trematodes. Once considered to be a non-living component, it is now known to be a dynamic cellular structure.
In cestodes the tegument is further covered with highly specialized In trematodes the tegument contains a number of invaginations or surface pits, and is externally lined with minute The tegument is the host-parasite interface, and metabolically active body covering performing all the vital activities such as protection, absorption and secretion. In fact it is a living structure consisting of proteins, lipids, carbohydrates and RNA. Sensory cells (e.g., eyes, ciliated pits, and rhabdite rods) and the central nervous system are concentrated in the anterior part, whereas the … The patient suffers from anaemia, pain, fever, liver and spleen enlargement, and diarrhoea.It is also known as liver fluke since it resides in the liver and bile duct of sheep and goat.
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