[15] - C Two distinct body plans(medusa& polyp D...

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Lecture 15 – Invertebrates I I. Evolution and Biodiversity A. 95% of animal species are invertebrates (i.e. lack a vertebral column) 1. 75% of animal species are insects B. Important evolutionary characters 2. tissue layers (diplo vs triploblastic) 3. true tissues 4. digestive tract (incomplete versus complete) 5. circulatory system (open, closed, absent) 6. Coelm (acoelomate, pseudocoelomate, coelomate) II. Porifera (sponges) A. Asymetric, diploblastic B. No true organs C. Unique structures and cells 1. spicules 2. choanocytes (collar cells), porocytes (pore cells), amoebocytes 3. mesohyl III. Cnidarians (corals and jellyfish) A. Radially symmetric, diploblastic B. True tissues / organ system
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Unformatted text preview: C. Two distinct body plans (medusa & polyp) D. Gastrovascular cavity IV. Ctenophora (comb jelly) A. Radial. Diploblastic B. 8 combs V. Platyhelminthes (flatworms) A. Bilateral, triploblastic ( all remaining phyla are bilateral & triploblastic ) B. Acoelomates C. Incomplete gut D. No circulatory system VI. Rotifera (wheel bearers) A. Pseudocoelomates B. Complete gut C. No circulatory system D. Corona VII. Nematoda (round worms – non-segmented) A. Pseudocoelomates B. Complete gut C. No circulatory system D. Longitudinal muscles E. Some species parasitic a. E.g. trichinosis & elephantitis VIII. Nemertea (ribbon worms) A. Coelomates B. Complete gut C. Closed circulatory system D. Proboscis...
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This note was uploaded on 04/19/2008 for the course BSC 2011 taught by Professor Fedorka during the Spring '08 term at University of Central Florida.

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[15] - C Two distinct body plans(medusa& polyp D...

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