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Phylum Annelida

Phylum Annelida. The segmented worms. Basic Facts . Name meaning: little rings Invertebrates Bilateral Symmetry Segmentation of body (Divided up into pieces) Have a fluid filled body cavity called a coelom. Basic Facts cont…. Contain organs and organ systems

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Phylum Annelida

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  1. Phylum Annelida The segmented worms

  2. Basic Facts • Name meaning: little rings • Invertebrates • Bilateral Symmetry • Segmentation of body (Divided up into pieces) • Have a fluid filled body cavity called a coelom

  3. Basic Facts cont….. • Contain organs and organ systems • Organs are suspended and supported by fluid in the coelom • Exchange gases and waste through skin (Diffusion) • Longitudinal and circular muscles span body length • Digestive muscles move food through body= Peristalsis • Reproduction= Predominately sexual

  4. 3 Classes of Annelids Polychaeta Oligochaeta Hirudina

  5. Class Polychaeta • Aquatic Tube Worms • 6500 known species • Live in an underground burrow

  6. Hirudina • 300 species • Bloodsucking parasites called leeches • Parasitic leeches can release a substance to prevent clotting and remain attached to host. • Non-parasitic leeches feed temporarily and remove when full of blood

  7. Class Hirudina cont….. • Used commonly in medical practices to reduce swelling in patients

  8. Class Oligochaeta • Earthworms • 2500 known species • Detrivores (eat dead and decaying material in soil) • Used to aerate/plow soil in gardens or compost piles • Hermaphroditic Sexual Reproduction

  9. Earthworm mating

  10. Earthworm Reproduction • Earthworms arrange themselves to share reproductive fluids. • Each worm has the capability to produce or receive eggs or sperm • Newly fertilized eggs are left to develop inside of a slime ring • Worms will crawl out of the slime ring when fully developed.

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