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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