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Platyhelminthes flatworms Characteristic with examples zoology invertebrate
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For notes of this lecture, follow our telegram channel : https://t.me/asteriskclasses • The phylum #Platyhelminthes, which includes #flatworms have the following characteristics features: • Phylum Platyhelminthes (Flatworms): Characteristics • 1. #Bilateral Symmetry: Platyhelminthes exhibit bilateral symmetry, meaning they have a distinct right and left side, with a single plane of symmetry running down their midline. • 2. #Triploblastic Organization: Unlike #cnidarians, flatworms are triploblastic, meaning they have three embryonic germ layers: ectoderm, mesoderm, and endoderm. • 3. #Acephalic: Most flatworms lack a true head, although they may have an anterior end with sensory structures, such as eyespots or chemoreceptors. • 4. #Gastrovascular Cavity: They have a sac-like gastrovascular cavity with a single opening that serves as both the mouth and anus. This cavity allows for digestion and nutrient absorption. • #asteriskclasses • 5. #Flattened Body: As the name suggests, flatworms have a flattened, ribbon-like body shape, which allows for efficient gas exchange through diffusion across their body surface. • 6. Simple #Nervous System: Flatworms have a simple nervous system consisting of a ladder-like arrangement of nerve cords and ganglia. Some possess primitive cephalization with nerve clusters in the anterior end. • 7. #Excretion and #Osmoregulation: They lack specialized excretory organs but rely on protonephridia, which are networked tubules that help regulate water and waste balance. • 8. #Hermaphroditic Reproduction: Many flatworm species are hermaphrodites, meaning they have both male and female reproductive organs. They can engage in cross-fertilization with other flatworms. • 9. #Parasitic and Free-Living: Flatworms display a wide range of lifestyles. While some are free-living and inhabit aquatic or moist terrestrial environments, others are parasitic and can infect vertebrates, including humans. • Examples: • #Planarians: These are free-living flatworms known for their remarkable regenerative abilities. They are often used in scientific studies. • #Tapeworms (Cestoda): Tapeworms are parasitic flatworms that typically live in the intestines of vertebrates and can cause health issues when infesting humans. • #Flukes (Trematoda): Flukes are another group of parasitic flatworms that can infect various animals, including fish and mammals. • These are some of the key characteristics and examples of organisms within the phylum Platyhelminthes. • #invertebrate #class9th #ncert #neet #quick
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