06 Annelida - Phylum Annelida The segmented worms Monday,...

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Unformatted text preview: Phylum Annelida The segmented worms Monday, June 13, 2011 Monday, June 13, 2011 Monday, June 13, 2011 Monday, June 13, 2011 Overview of annelid characteristics Eucoelomate- organ grade body organization coelom- body cavity lined by a peritonean forms by schizocoeloar peritonean- epithelium derived from mesoderm Anellida, Mollusca, Anthropods, Chordates, Echinoderms development is conservative ancient- Cambrian era- 9000-10000 speciec marine, freshwater, terrestrial Classes: Polychaetes- mostly marine; Olgichaetes- largely freshwater, terrestrial; Hirudinnaw- leeches bilateral symmetry w/ cephalization metameric body- consists of a series of more or less similar segments large coelom- metameric compartments Monday, June 13, 2011 non metameres: Head- prostomium, 1-2 peristomium schizocoelous- usually empty, except for gametes pygidium- terminal segment spiral, determinate development- trochophore larva w/ posterior growth region...
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06 Annelida - Phylum Annelida The segmented worms Monday,...

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