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Kingdom Animalia

Common Earth Worm. Kingdom Animalia. Phylum Annelida. A Presentation By: Heather & Esther. Common Name: Segmented Worms. Leech (medicinal). Video 1: Locomotion of an Annelid http://www.youtube.com/watch?v=dHkDdLQ32ys. Locomotion: Setae (hairs) and Parapodia (limbs).

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Kingdom Animalia

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  1. Common Earth Worm Kingdom Animalia Phylum Annelida A Presentation By: Heather & Esther

  2. Common Name: Segmented Worms Leech (medicinal) Video 1: Locomotion of an Annelid http://www.youtube.com/watch?v=dHkDdLQ32ys Locomotion: Setae (hairs) and Parapodia (limbs) Digestion: Extracellular (mouth and anus) Video 2: Simplified Digestion of an Annelid http://www.youtube.com/watch?v=oH8NMYi7qqw

  3. Annelids Body Segmentation: Segmented into Metameres (metameres: repeated sections with individual structures) Body Plan: A Coelomate Animal (coelomate: gap between endoderm and outer tubes) *1st Animals to develop a complete coelom* Body Symmetry: Bilateral (2 sides are symmetrical) Support: Muscle groups and simple Appendages

  4. Annelids: Polychaetes & Oligochaetes Nutrition: Marine Worms- filter feeders or scavengers Earth Worms- digest organic materials from the soil Leeches- predators, feed on the blood of other animals Vascular: Closed System of Blood Vessels (contains several muscular vessels- “hearts”)

  5. Gas Exchange Capillary beds pick up or release nutrients and oxygen Respiratory gas diffuses across the body wall Gas exchange occurs between capillary beds of body surface and environment Oxygen is carried by respiratory pigment(hemoglobin) in the blood plasma

  6. Defense Mechanisms and Response to Stimuli Nervous system Cerebral ganglia and Ventral nerve cord with paired segmental ganglia in etch segment This helps coordinate swimming/crawling Eyes in some polychaetes, not in Earthworms or leeches Receptor 2 light, chemical, & mechanical stimulant on body surface

  7. Excretion • Kidney-like organ: Nephridium - One per segment (metamere). - Nephrostoma (openings) collect residuals from mesoderm - filters residue and causes reabsorbtion. - Material excreted by nephridiopore (one body surface)

  8. Reproduction Polychaeta • Regenerate lost segments, and may naturally break off if grabbed by a predator • They reproduce by either Binary Fission/budding Oligochaeta • This kind reproduces sexually by cross fertilization (exchange sperm) • Align opposite direction, exchange sperm • Clitella secretes mucus cocoon. • Cocoon slides along worm, picking up eggs and then storing sperm • Cocoon slips off worm’s head and remains in the soil while embryo develops • Hatches from cocoon

  9. QUIZTIME!!! CROSS FERTILIZATION!! BILATERAL!!! How do oligochaeta reproduce? What type of body symmetry do Annelida have?

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