BIO 13 - Invertebrates - h Protostomes 2 major...

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Sheet1 Page 1 BIO 13 - Invertebrate - Ctenophora 1. different from cnidarian because ctenophora has complete guts. 2. movement is by means of beating cillia because they have no muscles (mesoderm) Protostomes (invertabrate) and Deutrostomes (vertebrate): 1. * cleavage * : In the early development of protostomes and deutrostomes, the early embryonic development was different: in protostomes, the blastula forms by spural cleavage, in deutrostomes the blastula (ball structures) was formed by radial copy 2. * gastrulation * : in protostomes, the blastophore becomes mouth, in deutrostomes the blastophore becoomes anus. 3. * formation of coelom * : in protostomes, the coelom comes from the mesoderm. In deutrostomes, the coelom comes from t
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Unformatted text preview: h Protostomes: 2 major lineages (monophyletic group) 1. Lophotrochozoa 2. Ecdysozoa (growth by molting) Lophotrochozoa: 1. platyhelminthes (flatworm): acoelomate (no coelom/ fluid filled tube) --> move by cillia therefore no coeloem is needed. Los s 2. Rotifera: similar to stentor __. but underwent gastrulation so although tiny, it's multicellular complex organism 3. Annelida (segmented worms): have coelom that acts as hydrostatic skeleton. (have ganglia that are spread out through out 4. mollusca: have mantle that normally secretes shell (so don't need hydrostatic skeleton) a. chitons\ b. bivalves c. chepalopods d. gastropods...
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This note was uploaded on 04/25/2010 for the course BIOLOGY BIO153 taught by Professor Cordon during the Fall '10 term at University of Toronto.

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