by john cashman and jason holthaus

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By John Cashman and Jason Holthaus

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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:


  • By John Cashman and Jason Holthaus

  • What is it?Latin word anellis which means ringAnnelids are ringed wormsDifferentiated by their segmentsLength:
  • What are Chaetae?Voice Thread!:)A voice thread link that will help you to understand more about what the chaetae is and its function

  • OceansFresh WaterLand

  • Earthworms are commonly sold as baitThe same goes with leechesEarthworms are also do great things for the soil in gardensLeeches saliva may someday also be used to prevent blood clots in humans

  • Food SourceHeterotrophic creatures (require organic substances)Earthworms ingest soil and extract nutrients from itLeeches are predators that usually swallow their prey but sometimes just suck the bloodBristle worms move their bristles and trap particles to ingest

  • How Theyre UniqueAll have segmented bodiesBodies are sealed with a wall or septaEach segment contains separate body partsThey have evolved to be more adaptable to their environment

  • PolychaeteLives in marine habitatOver 10,000 different speciesEx. Bristle WormsPolychaeta is Latin for many bristles

  • Lives on land3,500 speciesAlso live in swamps and marshesOligochaeta means "few-bristledEx. Earthworms

  • HiruindeaAround 500 speciesLive on land, saltwater, and freshwaterSome suck blood, but many don'tHave little to no chaetaeEx. Leech

  • Annelids use their strong muscles to support their shapeThey are an invertebrate meaning they have no bonesTheir ring-like muscles help them to support their shape

  • Oxygen is diffused through body surfaceThen it is used by the capillariesThese are very close to the surface and make it easier to use the oxygenCarbon Dioxide is then diffused back out through the skin

  • Some Annelids use asexual reproductionThis means they can produce offspring by breaking off part of their bodySome are also hermaphroditesThis means they have characteristics of both sexesMany though have either male or female and require a partner to reproduceThey develop segment by segment until adulthood

  • Very primitive brain by the mouthThey have nerve cords traveling the length of their bodiesSensory OrgansEyesTaste budsTactical TentaclesStatocysts

  • Annelids have a closed circulatory systemRing vessels function as small heartsBlood moves to the head through a contractile vesselThe two main vessels are the dorsal and ventral blood vessels

  • Excretory SystemCentral unit is the NephridiaThere are different types of Nephridia for different types of AnnelidsThe Protonephridia are joined to a duct that flushes out of the subjectThe Metanephridia contain cilia and open to the outside of the subject

  • One long digestive tractFood is stored in the cropGround up by the gizzardThey have unsegmented guts.Also have separate pharynx and stomach

  • ExamplesEarthwormsBristle WormsLeechesLug WormsBamboo WormsAnd thousands more

  • Basic Annelid Diagram

  • Works CitedFlourence, Wayne K. "Annelida (Segmented Worms, Including Earthworms, Leeches and Polychaetes)." Biodiversity Explorer. 24 May 2007. 02 Apr. 2008 .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 <>.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 .Rouse, Greg W. "Annelida." Tree of Life. 07 Aug. 2002. Australian Research Council.1 Apr. 2008 .Russel, Bruce J. "Branches on the Tree of Life: Annelids." Bio Media Associates. 2000. 02 Apr. 2008 .