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By John Cashman and Jason Holthaus

Annelids. By John Cashman and Jason Holthaus. What is it?. Latin word anellis which means ring Annelids are ringed worms Differentiated by their segments Length: <1 inch and upwards of 11 feet Uses chaetae (small bristles) to move. What are Chaetae?. Voice Thread!:)

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By John Cashman and Jason Holthaus

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  1. Annelids By John Cashman and Jason Holthaus

  2. What is it? • Latin word anellis which means ring • Annelids are ringed worms • Differentiated by their segments • Length: <1 inch and upwards of 11 feet • Uses chaetae (small bristles) to move

  3. What are Chaetae? • Voice Thread!:) • A voice thread link that will help you to understand more about what the chaetae is and its function

  4. Habitat • Oceans • Fresh Water • Land

  5. Importance to Humans • Earthworms are commonly sold as bait • The same goes with leeches • Earthworms are also do great things for the soil in gardens • Leeches saliva may someday also be used to prevent blood clots in humans

  6. Food Source • Heterotrophic creatures (require organic substances) • Earthworms ingest soil and extract nutrients from it • Leeches are predators that usually swallow their prey but sometimes just suck the blood • Bristle worms move their bristles and trap particles to ingest

  7. How They’re Unique • All have segmented bodies • Bodies are sealed with a wall or septa • Each segment contains separate body parts • They have evolved to be more adaptable to their environment

  8. Polychaete • Lives in marine habitat • Over 10,000 different species • Ex. Bristle Worms • Polychaeta is Latin for “many bristles”

  9. Lives on land 3,500 species Also live in swamps and marshes Oligochaeta means "few-bristled” Ex. Earthworms Oligochaeta

  10. Hiruindea • Around 500 species • Live on land, saltwater, and freshwater • Some suck blood, but many don't • Have little to no chaetae • Ex. Leech

  11. Supporting Their Shape • Annelids use their strong muscles to support their shape • They are an invertebrate meaning they have no bones • Their ring-like muscles help them to support their shape

  12. Respiration • Oxygen is diffused through body surface • Then it is used by the capillaries • These are very close to the surface and make it easier to use the oxygen • Carbon Dioxide is then diffused back out through the skin

  13. Reproduction • Some Annelids use asexual reproduction • This means they can produce offspring by breaking off part of their body • Some are also hermaphrodites • This means they have characteristics of both sexes • Many though have either male or female and require a partner to reproduce • They develop segment by segment until adulthood

  14. Nervous System • Very primitive brain by the mouth • They have nerve cords traveling the length of their bodies • Sensory Organs • Eyes • Taste buds • Tactical Tentacles • Statocysts

  15. Circulatory System • Annelids have a closed circulatory system • Ring vessels function as small hearts • Blood moves to the head through a contractile vessel • The two main vessels are the dorsal and ventral blood vessels

  16. Excretory System • Central unit is the Nephridia • There are different types of Nephridia for different types of Annelids • The Protonephridia are joined to a duct that flushes out of the subject • The Metanephridia contain cilia and open to the outside of the subject

  17. Digestive System • One long digestive tract • Food is stored in the crop • Ground up by the gizzard • They have unsegmented guts. • Also have separate pharynx and stomach

  18. Examples • Earthworms • Bristle Worms • Leeches • Lug Worms • Bamboo Worms • And thousands more

  19. Basic Annelid Diagram

  20. Works Cited Flourence, Wayne K. "Annelida (Segmented Worms, Including Earthworms, Leeches and Polychaetes)." Biodiversity Explorer. 24 May 2007. 02 Apr. 2008 <http://www.biodiversityexplorer.org/mm/annelids/>. Miller, Kenneth R., and Joseph Levine. Biology the Living Science. Needham: Prentice Hall, 1998. 447-452. Myer, Phil. "Phylum Annelida." Animal Diversity Web. 2001. University of Michigan Museum of Zoology. 02 Apr. 2008 < http://animaldiversity.ummz.umich.edu. Annelida.html>. Parker, Steve. Nematodes, Leeches & Other Worms. Minneapolis: Compass Point Books, 2006. 18-21. Ramel, Gordon. "The Phylum Annelida." Earthlife. 7 Jan. 2008. Earthlife Web. 1 Apr. 2008 <http://www.earthlife.net/inverts/annelida.html>. Rouse, Greg W. "Annelida." Tree of Life. 07 Aug. 2002. Australian Research Council.1 Apr. 2008 <http://www.tolweb.org/Annelida>. Russel, Bruce J. "Branches on the Tree of Life: Annelids." Bio Media Associates. 2000. 02 Apr. 2008 <http://ebiomedia.com/prod/BOanelids.html>.

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