Bis2C%20Lectu\re%2027%20F%202010

Bis2C%20Lectu\re%2027%20F%202010 - Fall 2010 Keen Lecture...

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Fall 2010 Keen Lecture 27. Development characters, body plans, and phylogeny (12 November) characters that define the major animal clades Students should be able to: describe cleavage explain how developmental pattern determines adult body plan outline the differences between diploblasts and triploblasts distinguish blind guts from complete guts explain how animals can have multiple body cavities identify the importance of developmental characters for phylogeny
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Metazoan Development: Fertilization and cleavage
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Fossil embryo from Doushantou formation, Yangtze plateau, China, dated about 600 mya. Recent molecular studies and the fossil record suggest that Eumetazoa arose ~650 mya. The 650 mya transition is consistent with an increase in diversity and turnover of assemblages of eukaryotes in the fossil record (“Ediacaran transition”). Recent research links this to a change in ocean chemistry; in particular the presence of a layer of oxygenated ocean water. See Science 328, 2 April 2010 p.53-54 .
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Bis2C%20Lectu\re%2027%20F%202010 - Fall 2010 Keen Lecture...

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