Phylum Annelida

Phylum Annelida - 2/20/2008 7:29:00 PM Phylum Annelida...

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20/02/2008 19:29:00 Phylum Annelida Segmented  worms Can be marine, fresh water and terrestrial They have organs but  no digestive tract  and they are segmented o Metameres  are repetitive similar body segments This allows them to have  controlled body movement  because  the muscles of different segments can act separately This is an  adaptation for burrowing and crawling They have a  trochopore  larva-same as mollusca Class Polychaeta “many bristles”, they have  parapodia  which are distinct fleshy, flattened lobed  appendages which protude laterally mostly found in marine habitats o Subclass Sedentaria These are  permanent burrowers , usually in  tubes They are  deposit feeders Their  parapodia are reduced  and  used to anchor  themselves  to tubes They  lack jaws and sensory organs  but do  have modified  gills  used to breathe while they are buried
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This note was uploaded on 04/26/2008 for the course BIOL 305 taught by Professor Green during the Spring '08 term at McGill.

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Phylum Annelida - 2/20/2008 7:29:00 PM Phylum Annelida...

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