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Flatworms. And. Roundworms. By Kevin, Floyd, Andrea, Melvyn. Worms. Invertebrates Soft Bodies Bilateral Symmetry Three Tissue Layers. Two Types Flatworms Roundworms. Flatworms. Flattened Bodies Mostly are Parasites, which means they depend on another organism for food and shelter.
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Flatworms And Roundworms By Kevin, Floyd, Andrea, Melvyn
Worms • Invertebrates • Soft Bodies • Bilateral Symmetry • Three Tissue Layers • Two Types • Flatworms • Roundworms
Flatworms • Flattened Bodies • Mostly are Parasites, which means they depend on another organism for food and shelter
Example of Flatworm Planarians • They are free-living flatworms, which means they don’t depend on another organism for food and shelter. • They have a triangle-shaped head with two eye spots, and one body opening, which is their mouths. • A thing called Pharynx connects the mouth and digestive tract. • They feed on small organisms and dead bodies of bigger organisms. • Most live under rocks, on plant material, or in freshwater. • They grow from 3 mm to 30 cm. • Their bodies are covered in cilia, a fine, hair like structure. • Planarians can reproduce sexually and asexually. • When they reproduce asexually, they divide in two. When they reproduce sexually, they produce eggs and sperm. • These type of flatworms have the ability to regenerate. • Most Planarians are hermaphrodites and exchange sperm, with one another. • They lay fertilized eggs that hatch in a few weeks.
Another Example of Flatworm Flukes • Most reproduce sexually, male worms deposits sperm in the female worm. • The female lays the fertilized eggs within the host. • The eggs exits the host through its urine or feces. • Schistosomiasis is caused by blood flukes-flatworms that live in the blood. • Other flukes can infect the lungs, liver, eyes, and other organs of their hosts.
Roundworms • Roundworms live on earth than any other type of many-celled organism. • It is estimated that more than half a million species of roundworms exist. • They are found in soil, animals, plants, freshwater, and salt water. • Most are free-living. • Roundworms are slender and tapered at both ends. • The body is a tube within a tube, with fluid in between. • They reproduce sexually. • They have male and female worms. • Roundworms have two openings, a mouth and an anus.