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Phylum Annelida (Chapter 27.3). Please set up your notebook for Cornell Notes. Annelids Characteristics Body divided into segments separated by walls called septa Have a coelom  coelomates Some worms have bristles called setae attached to each segment

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phylum annelida chapter 27 3

Phylum Annelida (Chapter 27.3)

Please set up your notebook for Cornell Notes



  • Characteristics
    • Body divided into segments separated by walls called septa
    • Have a coelom  coelomates
    • Some worms have bristles called setae attached to each segment
    • Have mouth and anus, digestive tract
    • Triploblastic  three germ layers

Form and Function

    • Feeding and digestion
      • Filter feeders, predators, decomposers
      • Have a pharynx
        • Pharynx has jaws in carnivores
        • Pharynx covered in sticky mucus in decomposers
        • Pharynx pumps food and soil into esophagus
          • Crop – stores food
          • Gizzard – grinds food into smaller pieces
        • Food absorbed in intestines


    • Annelids have a closed circulatory systems
      • Two major blood vessels
      • No heart – dorsal blood vessel contract and circulates blood
  • Respiration
    • Aquatic annelids breathe using gills feathery structures used to exchange gases underwater
    • Land dwelling annelids diffuse gases through moist skin


    • Digestive waste passes out of the anus
    • Nitrogenous waste is excreted through the nephridia organs that filter fluid in coelom
  • Response
    • Most annelids have a brain and several nerve cords
    • Marine annelids have many sensory adaptations
      • Sensory tentacles, chemical receptors, statocysts, eyes


    • Two major groups of muscles
      • Longitudinal  contract to make the worm shorter and fatter
      • Circular  contract to make worm longer and thinner
    • Marine annelids have paddle-like appendages called parapodia on each segment used for swimming and crawling


    • Most annelids reproduce sexually
      • Some have separate sexes, and external fertilization
      • Others are hermaphroditic but do not fertilize their own eggs
        • Two worms attach to each other, exchange sperm and store for later
        • When eggs are ready, the clitellum secretes a thick mucus ring where eggs and sperm are deposited
          • Ring slips off and provides a cocoon for developing larva
    • Some annelids reproduce asexually through budding

Classes of annelids

    • Class Oligochaeta
      • Stream-lined bodies with very few setae
      • Mostly live in soil and fresh water
      • Earthworms and tubifex worms

Class Hirudinea

    • External parasites that suck blood and body fluids
    • Leeches
    • Live in moist habitats in tropical countries
    • Have powerful suckers at both ends
      • Posterior  attachment
      • Anterior  Eating

Class Polychaeta

    • Marine annelids w/ paired, paddle-like appendages that have setae on the tip
    • Sandworms, blood worms
    • Live in cracks in coral reefs, in sand and mud and open water