Biology Notes 4-11-08

Biology Notes 4-11-08 - Biology Notes April 11, 2008 Major...

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Biology Notes April 11, 2008 Major Groups of Lophotrochozoans Annelids and mollusks are sister groups: Annelids: -Polychaetes : -mostly marine; burrow or tube. -Tentacles for filter feeding. -Parapodia on each segment function in gas exchange and movement. -External fertilization, separate sexes. -Pogonophorans are newly discovered polychaetes -live in hydrothermal deep sea vents -sessile, secrete a Chitinous tube -have no digestive tracts -have endosymbiotic bacteria that fix carbon using energy from the oxidation of H 2 S - Oligochaetes : -have no Parapodia or tentacles, few setae. -earthworms burrow in and ingest soil -all oligochaetes are hermaphroditic (both male and female). Each individual gives and receives sperm during copulation. - Leeches : -lack Parapodia and tentacles -reduces segments – coelom not divided -Segments at either end are modified to form suckers – temporarily anchors that aid in movement. -leeches are freshwater and terrestrial
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Biology Notes 4-11-08 - Biology Notes April 11, 2008 Major...

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