annelidae these guys try to worm their way into all ways of life
Post on 21-Dec-2015
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Annelidae
These guys try to worm their way into all ways of life
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Typical dissection approach
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I. General Characteristics• A. Bilateral symmetry• B. Cephalization• C. Coelom• D. Complete digestive tract• E. Segmentation• F. Nephridia• G. Circulatory system• H. Hydrostatic skeleton
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II. Organ systems
• A. Digestive System
• 1. muscular pharynx
• 2. esophagus• 3. crop• 4. gizzard• 5. intestine
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B. Nervous system
• 1. ganglia• 2. ventral nerve cord
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C. Circulatory system
• 1. closed circulatory system
• 2. dorsal blood vessel
• 3. five pairs of pseudohearts
• 4. ventral blood vessel
• 5. capillary network
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D. Reproductive system• 1. hermaphroditic• 2. male parts• 3. swapping of
sperm• 4. clitellum• 5. female parts
impossible to find for average
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The Great Exchange
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Fertilized eggs released in a cocoon
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E. Excretory system-nepridium
• 1. almost every segment has a nepridium
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nephridium
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III. Classes of annelids
• A. Oligochaets• 1. setae not
huge• 2. useful for
anchorage during locomotion
• 3. sequence of muscle contraction
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B. Polychaets
• 1. parapodia• 2. much more
elaborate• 3. locomotion• 4. moving fluid
through tubes• 5. excavation in
marine worms• 6. respiratory
surfaces
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Polychaet-feather duster worm
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Christmas Tree Worm
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C. Hirunidea-leeches
• One of man’s best friends
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Wonderful story• http://www.youtube.com/watch?v=ak6MX-QFRVc&
NR=1
http://www.youtube.com/watch?v=SxZbzZ5RE40&feature=related
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Cross section
• 1. coelom• 2. dorsal blood
vessel• 3. ventral nerve
cord• 4. muscle layers• 5. typhlosole• 6. nephridia• 7. setae