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Phylum Annelida

07 June 2012. Annelida.ppt. 2. Phylum Annelida. Phylum Annelida Latin ?ringed" analogy to tree annual rings~ 9000 speciesBody plan Tube-in-tube, Protostomous Bilateral symmetryCoelomate, ?split" coelomMarine, aquatic, terrestrial . 07 June 2012. Annelida.ppt. 3. Phylum Annelida. Tissues and

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Phylum Annelida

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    1. 07 June 2012 Annelida.ppt 1 Phylum Annelida “segmented worms”

    2. 07 June 2012 Annelida.ppt 2 Phylum Annelida Phylum Annelida Latin “ringed” analogy to tree annual rings ~ 9000 species Body plan Tube-in-tube, Protostomous Bilateral symmetry Coelomate, “split” coelom Marine, aquatic, terrestrial

    3. 07 June 2012 Annelida.ppt 3 Phylum Annelida Tissues and organs differentiated Segmentation highly developed Mesodermal “blocks,” each with own coelom Septa between segments

    4. 07 June 2012 Annelida.ppt 4 Phylum Annelida Hydrostatic skeleton Fluid pressure in coelom provides support & locomotion Circular muscles Longitudinal muscles Peristaltic locomotion

    5. 07 June 2012 Annelida.ppt 5 Function of a hydrostatic skeleton

    6. 07 June 2012 Annelida.ppt 6 Phylum Annelida Setae (“bristles”) of chitin “anchors” for earthworm “paddles” for polychaete Enlarged as jaws in leeches, some polychaetes

    7. 07 June 2012 Annelida.ppt 7 Animal Life Ways the needs of cells are met Food O2 and CO2 exchange Waste removal

    8. 07 June 2012 Annelida.ppt 8 Phylum Annelida Special concerns of a multicellular animal Circulation closed Coordination: Nervous system with paired ventral cords Structural support: Hydrostatic Movement: Hydrostatic Maintenance of water balance: Segmental metanephridia. Reproduction Usually sexual, sexes separate or hermaphroditic

    9. 07 June 2012 Annelida.ppt 9 Phylum Annelida Closed circulatory system Multiple “hearts” Hemoglobin not in blood cells reddish-pink color

    10. 07 June 2012 Annelida.ppt 10 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

    11. 07 June 2012 Annelida.ppt 11 Phylum Annelida Earthworms’ paired nerve cords are fused into single ventral cord Arthropod better illustrates primitive nervous system of both phyla.

    12. 07 June 2012 Annelida.ppt 12 Phylum Annelida Metanephridia for excretion of metabolic waste products

    13. 07 June 2012 Annelida.ppt 13 Phylum Annelida Class Polychaeta “many setae,” clusters with 20+ setae parapodia

    14. 07 June 2012 Annelida.ppt 14 Phylum Annelida Class Oligochaeta few setae in 2-4 clusters per segment Clitellum

    15. 07 June 2012 Annelida.ppt 15 Phylum Annelida Class Hirudinea pair of bladelike “jaws” posterior “suction cup” Predators External parasites, “bloodsuckers” Secrete anticoagulants Medicinal use

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