Phylum annelida chapter 27 3
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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)

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Phylum annelida chapter 27 3

Phylum Annelida (Chapter 27.3)

Please set up your notebook for Cornell Notes


Phylum annelida chapter 27 3

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

    • Have mouth and anus, digestive tract

    • Triploblastic  three germ layers


Phylum annelida chapter 27 3

  • 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


Phylum annelida chapter 27 3

  • Circulation

    • 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


Phylum annelida chapter 27 3

  • Excretion

    • 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


Phylum annelida chapter 27 3

  • Movement

    • 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


Phylum annelida chapter 27 3

  • Reproduction

    • 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


Phylum annelida chapter 27 3

  • Classes of annelids

    • Class Oligochaeta

      • Stream-lined bodies with very few setae

      • Mostly live in soil and fresh water

      • Earthworms and tubifex worms


Phylum annelida chapter 27 3

  • 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


Phylum annelida chapter 27 3

  • 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


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