RAH_20Lec_206_20__20Annelids - Hough Lecture Outline -...

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Hough Lecture Outline - Annelids 1 SEGMENTED COELOMATES all remaining protostomes and chordate deuterostomes (but not echinoderms) Embryonic (and evolutionary) origin of segmentation: the appearance of somites , a series of repeating mesoderm units running the length of the embryo || || || || || || || || || || || || the somites develop into repeated, paired copies of muscle groups, or organs, or appendages, etc. Significance of segmentation: multiple copies of organs etc. provides “backup” redundancy t o survive injury to one body region allows greater complexity and flexibility, especially in locomotion, and most especially with paired external appendages although adults of some advanced species do not explicitly show segmentation, it is present in their embryos and in certain internal structures
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Hough Lecture Outline - Annelids 2 PHYLUM ANNELIDA segmented coelomate worms: polycheates, earthworms, leeches General characteristics ring-like segments separated by
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This note was uploaded on 08/03/2010 for the course BIO 1500 taught by Professor Pandolfi during the Winter '08 term at Wayne State University.

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RAH_20Lec_206_20__20Annelids - Hough Lecture Outline -...

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