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Phylum Annelida

Phylum Annelida. Annelid - A round worm like animal that has a segmented body -Aquatic or land -Segments are separated by internal walls called septa (almost every segment looks identical). Feeding - long digestive tract -mouth and anus -have a pharynx

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Phylum Annelida

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  1. Phylum Annelida Annelid- A round worm like animal that has a segmented body -Aquatic or land -Segments are separated by internal walls called septa (almost every segment looks identical)

  2. Feeding - long digestive tract -mouth and anus -have a pharynx -carnivore/herbivore/filter feeder/detritus **Have a crop (stores food) and a gizzard (grinds the food)

  3. Digestive System

  4. Respiration - aquatic= gills -land = cutaneous (diffusion through skin/cuticle) • Internal Transport (closed circulatory system) -two blood vessels i.)dorsal blood (blood moves towards head from anus PA) ii.)ventral vessel (blood moves towards anus from head A  P)

  5. Excretion - solid undigested waste= anus (waste is called castings) -ammonia/metabolic waste = nephridia • Response - brain and ganglia -nerve cord **Most have: -statocysts -chemical receptors /sensory cells -eyes (light sensitive)

  6. Movement: two major muscle groups 1.) Longitudinal (run anterior/posterior) -contract=shorter/longer 2.) Circular (around the body) -contract = skinny/”fatter” **Many have setae/bristles

  7. Reproduction: -Most are sexual/separate sexes (external fertilization) -earthworms and leeches are hermaphrodites (internal fertilization) -contain a clitellum (mucus protection that slides off and protects the fertilized eggs)

  8. Three Different Classes • Polychaetes

  9. Oligochaetes

  10. Hirudinea

  11. annelid summary video

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