Flatworm Lab: Platyhelminthes Experimental Design: Planaria are free-swimming mostly freshwater flatworms. Flatworms are very unique creatures because they regenerate lost parts. My groups experiment was‚ The Effect of Darker Regions on Planaria Movement. The purpose of this experiment was to see whether or not the planaria preferred the white region or the dark region. My hypothesis was‚ If the Planaria are placed on the white side then they will move to the dark side because the planaria have
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possess a hair like structure called cilia which help in their motility. The light which falls on these cilia is reflected back and this simple property of light reflection makes these rainbow Jellyfish fluorescent. Cycloporus Venetus (Blue Flatworm) FLATWORMS - UMMM. THEY’RE FLAT We have to run out of steam there.
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Cestoda is the name given to a class of parasitic flatworms‚ of the phylum Platyhelminthes. Informally biologists refer to them as Cestodes. The most notorious species commonly are called tapeworms‚ for example Taenia solium‚ the "pork tapeworm". Cestodes are all parasitic and their life histories vary‚ but typically they live in the digestive tracts of vertebrates as adults‚ and often in the bodies of other species of animals as juveniles. Over a thousand species have been described‚ and all vertebrate
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and how do they help a cnidarian obtain its food? 10. What is the nervous system of a cnidarian? Do they have a brain? 11. What is the “skeleton” of a cnidarian? Explain how this type of skeleton works. 12. Platyhelminthes means “flatworm‚” which describes the shape of these worms. This phylum is triploblastic and acoelomate. There is no specialized system for gas exchange and it occurs by
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nourishment and directing the organism’s bodies towards safety or a food source. The cephalization of the Platyhelminthes was a branch off of the early jellyfish‚ which were radial‚ and not bilaterally symmetrical‚ which distinguished them from the flatworms. To be bilaterally symmetrical‚ an animal must have two identical sides of their body down the middle. The radial symmetry possessed by the jellyfish allows for one to draw a line anywhere through the organism and achieve symmetry. This stemmed from
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Platyhelminthes is a Flatworm. The meaning of Platy is flat‚ and the meaning of helminthes is a worm. So it`s very straight forward what the meaning Platyhelminthes is. Flatworms are very simple animals with bilateral symmetry. Flatworms are only a few mm. thick‚ but can be up to 20 m. long! They have one or more pairs of eyes and sensitive organs called ocelli. The eyes don`t see objects‚ but instead they detect light or darkness to they`re environment. A typical environment for a flatworm to found in would
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are the flatworm and the roundworms. However‚ every kind belongs to different phylum‚ so they are not closely related to each other. Flatworms ( phylum Platyhelminthes) and roundworms ( phylum Nematoda)‚ but there are many similarities and differences between these two types of organisms. Similarity: • There are many similarities between the two groups of worms‚ Platyhelminthes and Nematoda. There are true animals and have all characteristic that Classified as Eumetazoa .Both flatworms and roundworms
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Significance of Planarians Planarians are non-parasitic flatworms of the phylum Platyhelmintes found in fresh water like ponds or lakes. In my research paper I focused on Schmidtea mediterranea planarians found in Tusinia and southern Europe which are extensively used as a model organism to study development and regeneration process (Newmark 2012). Schmidtea mediterranea are chosen by researcher in molecular biology and genetics field because these planarians have diploid chromosomes and are hermaphrodite
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because soft-bodied organisms do not fossilize well. Scientists believe that the first flatworm began to evolve 550 years ago. Platyhelminthes otherwise known as “flatworms” have a wide variety of species within the phylum and have positive and negative effects on those who interact with them. Some examples of Platyhelminthes include Tapeworms‚ Flukes and Planaria. The unifying characteristics of the flatworm include that they are mostly parasitic‚ have bilateral symmetry‚ their nervous system includes
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species solve these problems by secreting a calcareous carapace‚ or shell‚ an exoskeleton to support and protect them and to prevent dehydration. Platy Hemises- commonly called flatworm. have no body cavity other than the gut‚ same pharyngeal opening both takes in food and expels waste. Lack of a cavity also constrains flatworms to be flat. Earthworm-segmented worm. they inhabit every bit of moist soil in the world. they possess bilateral symmetry and are made up of segments that look like little rings
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