Cnidarians 2009

Cnidarians 2009 - Howareanimals characterized?...

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How are animals  characterized? (Defining characteristics)
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Porifera Cnidaria Ctenophora Phoronida Ectoprocta Brachiopoda Echinodermata Chordata Platyhelminthes Mollusca Annelida Arthropoda Rotifera Nemertea Nematoda Radiata Deuterostomia Protostomia Bilateria Eumetazoa Metazoa Ancestral colonial flagellate Parazoa
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Parazoa Bilateria Asymmetry Radiata Eumetazoa
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Why are the Parazoa so  distinct from any other  type of animal?
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Parazoa  Sponges “beside the animals” no true tissues Eumetazoa All other animals “true animals” animals with true tissues Kingdom Animalia (metazoans) divided into  clades  or  Subkingdoms: Parazoa  and  Eumetazoa
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As animals evolved  from a simple  organization to a more  complex organization,  tissue cells became  more specialized. 
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Kingdom: Animalia Subkingdom: Eumetazoa Phylum: Cnidaria hydra, sea anemones, jellies, corals
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Phylum: Cnidaria True tissues  cells act together to perform a function evolutionary step above Porifera’s cellular level of  organization 5 specialized cell types: nerve cells- sensory gland cells- ex. endodermal gland cells for digestion nematocytes- make toxins muscle cells- for movement interstitial cells- undifferentiated, can become any cell  type 2 main body forms sessile polyp (hydra) free-swimming medusa (jellyfish)
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How is this cellular level  of organization different  from the sponges?
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Symmetry of Cnidarians compared to Sponges
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Phylum: Cnidaria Most primitive Eumetazoan Radial symmetry
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How might the  Cnidarians (aquatic  organisms) feed  compared to the  Sponges?
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Nematocyte (contained within Cnidocyte) “stinging cells” contain nematocyst
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Considering the  aforementioned  structure, how might the  function of feeding be  enabled?
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Phylum: Cnidaria Most primitive Eumetazoan Radial symmetry All members have  nematocytes  (cnidocytes)   specialized cells for capturing prey contain organelles called  nematocysts   (cnidocysts)   eject barbed thread tipped with toxins Carnivorous nematocyst studded tentacles to capture prey  larger and more complex than themselves
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Embryonic development  of Cnidarians compared  to Sponges
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Embryonic development
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This note was uploaded on 06/05/2011 for the course BIO 1201 taught by Professor N.haque during the Spring '09 term at CUNY City Tech.

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Cnidarians 2009 - Howareanimals characterized?...

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