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Annelida

Annelida. By: Kiran Basava Isabelle Nievera. http://folkworm.ceri.memphis.edu/ew-doc/GIFS/ew.logo.gif. Means “little rings” which resembles the annelids body, which is a series of fused rings. Live in the sea, freshwater habitats, and damp soil. Annelida.

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Annelida

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  1. Annelida By: Kiran Basava Isabelle Nievera http://folkworm.ceri.memphis.edu/ew-doc/GIFS/ew.logo.gif

  2. Means “little rings” which resembles the annelids body, which is a series of fused rings. Live in the sea, freshwater habitats, and damp soil. Annelida http://www.botswanagallery.org/thesis/A/img2/earthworms.jpg

  3. Classes http://www.freewebs.com/invertebratezoology/Earthworm1.jpg http://marinediscovery.arizona.edu/alex%20tuttle%20webpage/fireworm.jpg Oligochaetea (earthworms) Polychaeta http://itsmeela.files.wordpress.com/2007/07/450px-leech_blutegel.jpg Hirudinea (Leeches)

  4. Present Have a true coelom, a body cavity completely lined by tissue derived from mesoderm Body Cavity http://www.glogster.com/media/2/3/92/77/3927715.jpg

  5. bilateral symmetry http://www.sheppardsoftware.com/content/animals/images/clipart_earthworm.jpg Body Symmetry http://www.sheppardsoftware.com/content/animals/images/clipart_earthworm.jpg

  6. A brain-like pair of cerebral ganglia above and in front of the pharynx A ring of nerves around the pharynx that connects to a subpharyngeal ganglion, from which a fused pair of nerve cords runs posteriorly. Nervous System http://media-2.web.britannica.com/eb-media/37/73337-004-B0D75E62.jpg

  7. Have a closed circulatory system 5 pairs of hearts Blood vessels circle esophagus and pump blood Circulatory System http://infusion.allconet.org/webquest/img010.jpg

  8. Digestive System • Unsegmented digestive tract • Mouth Pharynx Esophagus Crop Gizzard Intestine Anus http://yhsbiology.wikispaces.com/file/view/digest.jpg/49088317/digest.jpg

  9. Excetory System Annelida have excretory organs called nephridia, directly remove waste from the bloodstream In earthworms (class Oligochaeta), waste is used to fertilize the soil http://image.tutorvista.com/content/excretion-and-osmoregulation/septal-nephridia-illustration.jpeg

  10. Locomotion/Musculature Each segment of an earthworm is surrounded by a longitudinal muscle that coordinates with a surrounding circular muscle to allow an earthworm to move Polychaetes have parapodia (“almost feet”) to move, and polychaetes and leeches can swim http://mfaucher.com/files/Uganda03/675dpi/ug14_25.jpg

  11. Skeletal Type None, their bodies are composed a a series of fused segments with muscles http://www.teachyourselves.co.uk/worm.jpg

  12. Sensory structure/features Have tactile organs (touch), taste buds, photoreceptor cells, and some have eyes with lenses Palps and antennae are located on the head (tactile) Also have lateral organs- epidermal sensory cells that are responsive to light or touch http://tolweb.org/onlinecontributors/app?service=external/ViewImageData&sp=3990

  13. Reproduction Hermaphrodites Cross fertilize by aligning to exchange sperm, which is stored while an organ called the clitellum makes a cocoon that receives the eggs and sperm from the worm, and remains in the soil while embryos develop. http://www.offthemarkcartoons.com/cartoons/2005-11-11.gif

  14. Gas Exchange Earthworms have many tiny blood vessels in their skins, which function as their respiratory organs The blood has hemoglobin that carries oxegen. In leeches, most gas exchange occurs through the body wall

  15. Unique Characteristics Easily recognized due to segmented bodies Most segments have the same internal structures repeated throughout the worm Leeches used to be used for blood letting, and today are used to drain blood that accumulates in tissues after injuries or surgeries

  16. QUESTION #1 • What type of body cavity do annelids have? • Coalomate • Pseudocoelomate • Acoelomate • none

  17. Answer A. COELOMATE

  18. QUESTION #2 An annelid’s circulatory system includes how many pairs of hearts? • 6 • 9 • 1 • 5

  19. ANSWER D. 5

  20. QUESTION #3 Describe the skeletal type of annelids. • They have an exoskeleton. • The do not have one. • They have a cuticle • They have a hydrostatic skeleton.

  21. ANSWER B. They do not have one

  22. QUESTION #4 How do earthworms exchange gas? • Diffusion • They do not. • They have many tiny blood vessels in their skins, which function as their respiratory organs

  23. ANSWER CThey have many tiny blood vessels in their skins, which function as their respiratory organs

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