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Annelida - Introduction
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Annelida - Introduction
http://orion1.paisley.ac.uk/courses/Tatner/biomedia/units/anne1.htm
Annelid worms, brought to you by Biological Sciences at the University of Paisley.
Biology > Biota > Fauna > Annelida
Jan 6, 2008
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Other links at Biology > Biota > Fauna > Annelida
Phylum: Annelida (segmented worms) - Iziko Museums of Cape Town, South African
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The phylum Annelida, segmented worms, is characterized by the possession of a coelom (body cavity), setae (moving bristles), and a body divided into segments by transverse rings.
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Annelid worms, brought to you by Biological Sciences at the University of Paisley.
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Anatomical illustrations of segmented worms from the University of California at Santa Cruz.
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6. Annelida
Comprehensive information on these organisms and their phylogenetic relationships from the Tree of Life Web Project, with photographs of several species.
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Phylum Annelida Introduction Annelids (segmented worms) are extremely successful and have invaded terrestrial, freshwater, and marine habitats. They include familiar forms such as earthworms and leeches and many diverse marine organisms.
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These are the most highly developed helminths, having segmented bodies, a circulatory system, nephridia (part of a primitive excretory system, but still much more advanced than the flame cells of, for example, the Platyhelminthes), a highly developed digestive system, and a primitive brain.
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Fluid in coelom provides hydrostatic pressure for hydrostatic skeleton . Epidermis secretes cuticle.
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Segmented worms - metameric organization (one compartment after another somites segments organized about the same). Annelids are very complex animals. First animal with a true coelom which runs the entire length of the body. Triploblastic; bilateral symmetry.
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