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Phylum Annelida

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Phylum Annelida

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    1. 02 April 2012 Annelida.ppt 1 Phylum Annelida “segmented worms”

    2. 02 April 2012 Annelida.ppt 2 Phylum Annelida ~ 9000 species Segmentation highly developed Mesodermal “blocks,” each with own coelom Septa between segments

    3. 02 April 2012 Annelida.ppt 3 Phylum Annelida Hydrostatic skeleton Fluid pressure in coelom provides support & locomotion Circular muscles Longitudinal muscles Peristaltic locomotion

    4. 02 April 2012 Annelida.ppt 4 Function of a hydrostatic skeleton

    5. 02 April 2012 Annelida.ppt 5 Phylum Annelida Setae (“bristles”) of chitin “anchors” for earthworm “paddles” for polychaete Enlarged as jaws in leeches, some polychaetes

    6. 02 April 2012 Annelida.ppt 6 Phylum Annelida Closed circulatory system Multiple “hearts” Hemoglobin not in blood cells reddish-pink color

    7. 02 April 2012 Annelida.ppt 7 Phylum Annelida Central nervous system Dorsal brain Pair of nerves on sides of esophagus Paired ventral nerve cords with paired ganglia in each segment Transverse nerves connect ganglia in each segment

    8. 02 April 2012 Annelida.ppt 8 Phylum Annelida Earthworms’ paired nerve cords are fused into single ventral cord Arthropod better illustrates primitive nervous system of both phyla.

    9. 02 April 2012 Annelida.ppt 9 Phylum Annelida Class Polychaetes “many setae,” clusters with 20+ setae parapodia

    10. 02 April 2012 Annelida.ppt 10 Phylum Annelida Class Earthworms few setae in 2-4 clusters per segment Clitellum

    11. 02 April 2012 Annelida.ppt 11 Phylum Annelida Class Leeches pair of bladelike “jaws” posterior “suction cup” Predators External parasites, “bloodsuckers” Secrete anticoagulants Medicinal use

    12. 02 April 2012 Annelida.ppt 12 Phylum Annelida Leeches Hirudin from leech, Hirudo medicinalis, inhibits blood clotting

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