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The Origin of Diploblastic Organisms

The Origin of Diploblastic Organisms. Avonlea Gardner, Stefani Williams, Ben Lawhorn, Max Rossa . Developed Characteristics within phylum Radiata. Radial morphology Diploblastic (two germ layers during development) – ectoderm and endoderm

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The Origin of Diploblastic Organisms

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  1. The Origin of Diploblastic Organisms Avonlea Gardner, Stefani Williams, Ben Lawhorn, Max Rossa

  2. Developed Characteristics within phylum Radiata Radial morphology Diploblastic (two germ layers during development) – ectoderm and endoderm Cnidocytes present- housing Nematocyst (Stinging cells) Nerve Network Extracellular digestion Muscular contractions via epitheliomuscular cells May provide evidence as the origin of mesoderm in Triploblastic organisms. Sexual reproduction and Asexual reproduction First evidence of cleavage in dividing cells

  3. Origins in Respect to Protists Members of Radiata have a few aspects in common with their more primitive unicellular ancestors, the Protists • Nematocysts • Some protists resemble nematocysts, or stinging cells, which Cnidaria have incorporated into their body plan to aid with protection and hunting prey • Cilia • Radiata, and especially Ctenophora, have incorporated Cilia tracts into their body plan, which aid in locomotion.

  4. Cnidarian’s Nerve Net A network of nerve cells • Unspecialized • Multifunctional neurons • sensory • motor • intersecretory • neurosecratory

  5. Ureumetazoan- believed to be a common ancestor of cnidarians and bilaterians • Cnidarians are thought to have originated very far back into the Cryogenian age

  6. Resources • http://www.imas.utas.edu.au/__data/assets/image/0006/271671/ctenophore_a_full.jpg • http://mageebio11spring2012.wordpress.com/2012/02/22/phylum-cnidaria/ • http://www.sciencemag.org/content/334/6059/1091.full • http://link.springer.com/chapter/10.1007/978-3-0348-9219-3_2

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