Chapter 33_study aides

Chapter 33_study aides - Chapter 33: Noncoelomate...

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Chapter 33: Noncoelomate Invertebrates study aide 1. Traditional vs. molecular phylogeny - agreement a. Parazoa (Porifera) = 1 st branch – separate from Eumetazoa b. Eumetazoa i. Cnidaria and ctenophore – branch out prior to Bilateria ii. Bilateria 1. Protostomes 2. Deuterostomes 2. Traditional phylogeny -based on coelom i. Acoelomates – protostomes ii. Pseudocoelomates – protostomes iii. Coelomates – protostomes and deuterostomes 3. Molecular phylogeny – new protostome classification – Spiralia and Ecdysozoa a. Spiralia i. Growth by adding mass ii. Many undergo spiral cleavage iii. Mainly aquatic iv. Move by cilia or muscle v. Two main groups 1. Lophotrochozoa – mostly coelomate a. Includes Brachipoda, Mollusca, Annelida b. Move by muscular contraction c. Trochophore larvae 2. Platyzoa – mostly acoelomate a. Includes Platyhelminthes, Micrognathozoa b. Flat c. Move by ciliary action b. Ecdysozoa i. Growth by molting ii. Movement by non-ciliary means iii. Non-spiral cleavage iv. Includes Nematoda (roundworms) and Arthropoda (insects, crustaceans, etc.) 4. Parazoa (= Porifera) a. Lack tissues, organs and symmetry b. Complex multicellularity c. Phylum Porifera (sponges) i. Aquatic ii. Larval sponges = free-swimming iii. Sessile adults
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iv. 3 functional layers of cells
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Chapter 33_study aides - Chapter 33: Noncoelomate...

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