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Phylum Annelida (Earthworms, Sandworms, Leeches)

Phylum Annelida (Earthworms, Sandworms, Leeches). By: Veronica Weigandt. Key Characteristics. Bilaterally symmetrical Closed circulatory system Has a nervous system Segmentation True Coelom No true respiratory organs. Anatomy. Segmented Intestine Anus Nerve Cord Coelom Septa

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Phylum Annelida (Earthworms, Sandworms, Leeches)

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  1. Phylum Annelida(Earthworms, Sandworms, Leeches) By: Veronica Weigandt

  2. Key Characteristics • Bilaterally symmetrical • Closed circulatory system • Has a nervous system • Segmentation • True Coelom • No true respiratory organs

  3. Anatomy • Segmented • Intestine • Anus • Nerve Cord • Coelom • Septa • Dorsal/Ventral blood vessel • Nephridia • Clitellum

  4. Anatomy (Cont.) • Mouth • Pharynx • Esophagus • Crop • Gizzard

  5. Digestive • 1 way digestion • Food goes into mouth • Pharynx helps food into mouth • Food is stored in crop • Gizzard breaks down food • Rest goes through intestines

  6. Respiration • Simple diffusion • Oxygen is consumed by body cells • Carbon dioxide diffuses through the body surface

  7. Internal Transport • Closed system of blood vessels • Blood pumps through body • Circulation

  8. Excretion • Nephridium • Fluid passes through nephridium into bladder-like sac • Sac opens through a pore in the skin & waste is discharged

  9. Response • Has a brain • Responds to: • Odors • Changes in moisture • Changes in temperature • Changes in light

  10. Movement • Various muscle groups • Parapodia • Setae sinks into the ground • Longitudinal muscles contract

  11. Reproduction • Reproduction is sexual • Join head to tail; exchanging sperm • Forms mocous sheath • Eggs get released into the sheath • Worm backs out of sheath • Sperm gets released into the sheath & fertilization occurs • Cocoon develops

  12. Examples Sandworms Leeches Earthworms

  13. Facts • Over 22,000 species • They live just about anywhere on earth • Most are found in wet environments • Can grow up to as long as 3 meters • Can range in their color, patterning, and other features

  14. Literature Cited • http://www.bu.edu/gk12/eric/Annelida.pdf • http://www.esu.edu/~milewski/intro_biol_two/lab__12_annel_arthro/Annelida.html • http://www.infusion.allconet.org/webquest/annelida.html • http://library.thinkquest.org/28751/review/animals/5.html# • http://www.biology-questions-and-answers.com/annelids.html • http://www.encyclopedia.com/topic/Annelida.aspx

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