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04_Cnidaria-Ctenophora

04_Cnidaria-Ctenophora - Lecture 4 Cnidaria and Ctenophora...

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Today! 1. Different +ssues allow specializa+on in diploblasts 1. Describe how Ectoderm/Endoderm share the work required for an organisms to grow 2. Describe how cnidarians sense and respond to the outside world 3. List the factors that allow cnidocytes to fire 2. Explore the diversity of Cnidaria 1. Contrast between the four major types of cnidarians 2. Explain how a variety of cnidarians replicate 3. Iden+fy the special adapta+ons of coral building cnidaria 3. Introduce the Ctenophora 1. Contrast between Cnidaria and Ctenophora Lecture 4: Cnidaria and Ctenophora à diploblasts have more fun! Look for more learning objectives soon!
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The Diploblasts Two germ layers, differing in function: ECTODERM - sensation, protection, food capture - Excretion, Support, Movement, (Reproduction) ENDODERM - Food Processing Include Cnidaria, Ctenophores à Radial and biradial symmetry Mesoglea In Cnidaria & Ctenophores Middle “jelly” layer Support, Elastic skeleton Mostly water, collagen Fig 13.3
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Cnidarian cell types Epitheliomuscular cells Cnidocyte Sensory Cells Gland cells Myofibrils Nutritive-muscular cells
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Cnidarians • Over 9,000 species • OLD! Fossil specimens dated to over 700 million years ago Cnidocytes contain nematocysts Fig 13.4 Cnidocytes are “one-time use” cells • Chemosensory Supporting cells – organic molecules from prey • Cnidocil – “trigger”, modified cilium sensitive to touch Only Cnidarians make cnidocytes
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Cnidocytes contain nematocysts Not all ^ Three main types: 1. Nematocysts – inject toxin for prey capture / defense – found in all classes of Cnidaria 2. Spirocysts
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