Lecture 14 - Invertebrate diversity I0

Lecture 14 - Invertebrate diversity I0 - Lecture 14...

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Lecture 14 – Invertebrates I I. What are Invertebrates - animals with no backbone (34 of 35 phyla) II. Animal Biodiversity A. 95% of animal species are invertebrates 1. 85% are arthropods 2. 73% of animal species are insects 3. 33% are beetles B. Important evolutionary characters 2. tissue layers (diplo versus triploblastic) 3. true tissues 4. digestive tract (incomplete versus complete) 5. circulatory system (open, closed, absent) 6. Coelm (acoelomate, pseudocoelomate, coelomate) III. Evolution of metazoan (animals). SEE FIG. 32.11 A. primitive animals were asymmetric and diploblastic with no true tissues (e.g. no muscle, nervous system, digestive system, etc). IV. Porifera (sponges) A. Asymetric, diploblastic B. No true organs C. Unique structures and cells 1. spicules – made of calcium carbonate or silica; provide structural support 2. choanocytes (collar cells), amoebocytes 3. Diplobastic; layers separated by gelatinous mesohyl V. Evolution of Eumetazoans (animals with true tissues)
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This note was uploaded on 08/19/2011 for the course BSC2011C 2011 taught by Professor Fedorka/song during the Spring '11 term at University of Central Florida.

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Lecture 14 - Invertebrate diversity I0 - Lecture 14...

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