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Transcript
Platyhelminthes By: Brianna Turner Z’Kiya Harper Cashmere Patin What are Platyhelminthes? Platyhelminthes are flatworms. They are invertebrates. They are a few millimeters thick. They are also soft. Symmetry Their symmetry is bilateral. Here is a Marine flatworm. Movement && Support Their movement is a cilia which helps them glide on their epidermal cells. Body Plan They are soft. They are flattened worms that have tissues and internal organs. Feeding && Digestion They are carnivores and scavengers. They digest food through diffusion Respiration Flatworms have no respiratory organs. Examples: no heart, blood vessels, no gills, etc. This is one of the many ways that flatworms look. Circulation Flatworms do not need a circulatory system. Excretion Flame Cells - specialized cells that filter && remove excess water from the body. Flame cells function in excretion. Response (Nervous System) The Nervous System allows the eyespot to gather food && find dark places to hide. Asexual Reproduction Asexual reproduction is common in free-living flatworms, it takes place in fission. The organism splits in to two, each half grows new parts to form a new organism. Sexual Reproduction They are hermaphrodites. They deliver sperm to each other && the eggs are laid in clusters. They hatch within weeks. Here is a picture of a laid egg. Subphylums/ Classes They are turbllarians, flukes, and tapeworms. Here is a picture of a Fluke. Platyhelminthes Turbllarians Free-living flatworms. Most live in marine or fresh water. Platyhelminthes Trematoda Also known as Flukes. Paratactic flatworms. Playhelminthes Cestoda Also known as Tapeworms. Can get into humans. Plathelminthes Monogenea Mostly on fish gills. Questions && Answers 1.True or False: Platyhelminthes are not hermanphrodites. FALSE 2.Can tapeworms get inside humans? YES 3.Can Platyhelminthes be asexual and sexual? YES 4.Where do Flame Cells occur? EXCRETION 5.What is their symmetry? BILATERAL