annelida by: omar abdulkader, marcus bray n00/1795523221/n00/1795523221/ (left)
TRANSCRIPT
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Annelida
By: Omar Abdulkader,Marcus Bray
http://www.flickr.com/photos/97968921@N00/1795523221/ (Left)
http://www.flickr.com/photos/pmforster/457146720/ (Right) Omar Abdulkader
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Examples:
• Polychaets (Christmas Tree Worm) Oligochaetes (Earth Worm)
Leech
Omar Abdulkader
http://www.flickr.com/photos/tim_uk/384626933/
http://www.flickr.com/photos/theju/254592404/
http://www.flickr.com/photos/neilrsmith/537946099/
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Body Symmetry
• Bilateral Symmetry
Omar Abdulkader
http://www.flickr.com/photos/35031054@N00/27111691/
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Body Cavity
• Coelom is present, and is separated by septum.
Omar Abdulkader
http://universe-review.ca/I10-82-cavity4.jpg
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Nervous System
• Cerebral Ganglia: A brain like pair of cerebral ganglia above and in front of pharynx near mouth.
• Nerve cords that run the length of animal.
• Ring of nerves around pharynx connects to a subpharyngealganglion, where fused pair of nerve cords run.
Omar Abdulkader
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Circulatory System
• A network of vessels (closed).
• Dorsal and Ventral Vessel connected by segmental pairs of vessels.
• Dorsal Vessel + 5 pairs of vessels that circle esophagus are muscular and pump blood through circulatory system.
Omar Abdulkader
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Digestive System
• One long intestine that runs length of animal (One-way).
Omar Abdulkader
http://www.zo.utexas.edu/faculty/sjasper/images/f26.5.jpg
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Excretory System
• Metanephridium: excretory tubes with ciliated funnels called nephrostomes
• Remove waste from the blood and coelomic fluid through exterior pores.
• Each segment of the worm has a pair of metanephridium.
Marcus Bray
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Locomotion
• All annelids have a two layer system of muscle. Longitudinal muscle surrounded by circular muscle.
• Contraction of these muscle against each other and the coelomic fluid cause the organism to move.
• Most annelids have chaetae which are bristles that provide traction for burrowing.
Marcus Bray
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Skeletal Type
• No true skeleton
• Instead muscles work against the non-compressible fluid of the coelom. (hydrostatic skeleton)
Marcus Bray
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Sensory Structures
• No specialized sensory structures other than nervous system
Marcus Bray
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Reproduction
• Annelids are hermaphrodites meaning they have both sperm an eggs
• Sexual: Annelids reproduce sexually by aliging themselves in order to exchange sperm. Then an organ called the clitellum creates a cocoon which picks up the sperm as well as and egg and deposits the fertilized egg in the soil.
Marcus Bray
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Gas Exchange
• Skin functions as respiratory organ
• Oxygen and carbon dioxide are exchanged in skin and oxygen is transferred to tiny blood vessel in epidermis.
Marcus Bray
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Unique Features/Facts
• Leeches are used in medicine for blood letting
• Earthworms are beneficial to famrers because they till the earth and the soil a good texture
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Quiz
1. What bristle-like structures do some annelids use to burrow?
2. What is the center of an annelid’s nervous system?
3. What functions as a hydrostatic skeleton in an annelid?
4. How does and annelid pump blood through its body?
Marcus Bray
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Answers
1. Chaetae
2. Cerebral Ganglia
3. Coelom fluid
4. By utilizing the muscles in the dorsal vessel and the five pairs of vessels that circle the esophogaus.
Marcus Bray