1 / 15

Fascinating World of Cnidarians - Oceanic Marvels

Explore the diverse world of Cnidarians (Coelentrates), invertebrates with true tissues, radial symmetry, and stinging cells. Discover the life cycle, examples, and importance of these marine creatures.

plato-moore
Télécharger la présentation

Fascinating World of Cnidarians - Oceanic Marvels

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Invertebrates Cnidarians a.k.a. Coelentrates http://images.google.com/imgres?imgurl=http://www.nature.com/nrg/journal/v2/n1/images/nrg0101_033a_f1.gif&imgrefurl=http://www.nature.com/nrg/journal/v2/n1/fig_tab/nrg0101_033a_F1.html&h=586&w=600&sz=151&hl=en&start=101&um=1&usg=__gZHBWlx7DZmkWnjNa0aVzIJQTsQ=&tbnid=l6634ZL0ujoJgM:&tbnh=132&tbnw=135&prev=/images%3Fq%3Dcnidarian%26start%3D100%26ndsp%3D20%26um%3D1%26hl%3Den%26safe%3Dactive%26rls%3Dcom.microsoft:*:IE-SearchBox%26rlz%3D1I7GGLD%26sa%3DN

  2. www.oceanicresearch.org mediumrarecreations.com http://images.google.com/imgres?imgurl=http://www.eurekalert.org/multimedia/pub/web/5544_web.jpg&imgrefurl=http://www.eurekalert.org/multimedia/pub/5544.php&h=298&w=400&sz=8&hl=en&start=78&um=1&usg=__ApgUaa5NOZiJ6eF_zndANErI688=&tbnid=v1FKrUhcjgsyqM:&tbnh=92&tbnw=124&prev=/images%3Fq%3Dcnidarian%26start%3D60%26ndsp%3D20%26um%3D1%26hl%3Den%26safe%3Dactive%26rls%3Dcom.microsoft:*:IE-SearchBox%26rlz%3D1I7GGLD%26sa%3DN

  3. Characteristics • “Cnidos” Name means stinging needles • true tissues, 2 tissue layers, tentacles, stinging cells, radial symmetry • Life cycle - • Polyp – stationary, tentacles and mouth face up • Ex. Corals and anemones • Medusa – move with the current, tentacles and mouth face down • ex. Jellyfish and man o war

  4. Examples of Cnidarians • coral, anemone, hydra, • jellyfish, Portuguese man-of-war http://images.google.com/imgres?imgurl=http://www.roumazeilles.net/news/en/wordpress/wp-content/uploads/2007/10/giant_jelly_fish.jpg&imgrefurl=http://www.roumazeilles.net/news/en/wordpress/2007/10/07/giant-jellyfish/&h=381&w=500&sz=102&hl=en&start=20&um=1&usg=__Vj2R-kvbALTLH-IOofJ9bMC_K-k=&tbnid=M3DVmObBIQkgIM:&tbnh=99&tbnw=130&prev=/images%3Fq%3Djellyfish%26um%3D1%26hl%3Den%26safe%3Dactive%26rls%3DGGLD,GGLD:2005-16,GGLD:en%26sa%3DN http://www.naturalsciences.org/education/deepsea/images/man-o-war.jpg

  5. Support • water pressure

  6. Movement • muscle cells and a ring of muscle around the bell of the medusa form

  7. Collecting food • stinging cells - nematocysts, tentacles

  8. Digestion • one cavity – gastrovascular • Food comes in wastes comes out same hole • Nutrients transported by diffusion

  9. Circulation & Respiration • none

  10. Nervous system • a nerve ring in the mesoglea (middle layer)

  11. Reproduction • budding - polyp form • sexual – medusa form - egg / sperm • Some alternate generations

  12. Importance to nature • big link in food chain, feed on plankton, corals provide home for most of the ocean’s species

  13. Importance to economy • coral, anemone

  14. Define these terms • Medusa • Polyp • Mesoglea • Alternate generations

  15. Video on cnidiarians • Google Image Result for http://www.scivee.tv/assets/videothumb/2753

More Related