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EARTHWORM

EARTHWORM. Taxonomy. Kingdom: Animalia Phylum: Annelida ( latin for “little ring”) Class: Oliochaeta (“few hair”) Genus: Lumbricus Species: terrestris. General info…. True coelom Bilatterally symmetrical Movement controlled by 2 sets of muscles ( longitundinal and circular).

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EARTHWORM

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  1. EARTHWORM

  2. Taxonomy • Kingdom: Animalia • Phylum: Annelida (latin for “little ring”) • Class: Oliochaeta (“few hair”) • Genus: Lumbricus • Species: terrestris

  3. General info… • True coelom • Bilatterally symmetrical • Movement controlled by 2 sets of muscles (longitundinal and circular)

  4. Digestion • Earthworm eats dirt • Tills the soil, allows air to get into the soil (aerates), fertilizes the soil with castings (waste) • Gets nutrients out of the top of the soil

  5. digestion • ROUTE THE FOOD FOLLOWS: • 1. prostomium: upper lip • 2. mouth • 3. pharynx: pulls soil in • 4. esophagus: long food tube • 5. crop: storage facility • 6. gizzard: organ that grinds the food • 7. intestines • 8. anus

  6. Respiration • No lungs; breathes through skin • Skin must stay moist; covered in mucus • Also has a cuticle layer to hold in moisture • Oxygen brought in and carbon dioxide exchanged through skin • Exchange of gases happens through diffusion

  7. circulatory • Closed system • Blood stays in vessels • 10 aortic arches that act as “hearts” to pump the blood • Blood carries oxygen and nutrients to the cell • Carbon dioxide and cellular waste away from cells

  8. Nervous SYSTEM • Doesn’t really have a brain, just a collection of nerves in segment 3 • This is referred to as cephalization • Ventral Nerve cord runs below the intestines • Has a ganglia in each segment

  9. Excretory System • Produces urine and carbon dioxide • Nephridia: acts like a “little kidney” and filters the blood • One pair of nephridia in almost every segement • Looks like a small white funnel

  10. Reproductive system • Earthworms are hermaphroditic (both sexes in one body) • They DO NOT self fertilize • Lay side by side going in opposite directions • Sperm is swapped and stored

  11. Reproductive system • Functions of the clitellum: • Makes the mucus that holds the worms together while sperm is swapped • Makes a mucus cocoon for the baby worms

  12. Reproductive system • The cocoon moves toward the anterior end of the animal • Sperm and eggs are picked up from openings in the skin • Fertilization occurs in the cocoon • Summed up by • SEXUAL and EXTERNAL

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