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Worm Phyla. Mr. Jeff Peterson. Worm Phyla. ALL WORMS: Invertebrates Reproduce Asexually and Sexually Sense organs and a brain Tissue < Organs < Systems Bilaterial Symmetry Narrow bodies without legs. Phylum Platyhelminthes. Flatworms They have 1 body opening.

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worm phyla

Worm Phyla

Mr. Jeff Peterson

worm phyla1
Worm Phyla
    • Invertebrates
    • Reproduce Asexually and Sexually
    • Sense organs and a brain
    • Tissue < Organs < Systems
    • Bilaterial Symmetry
    • Narrow bodies without legs
phylum platyhelminthes
Phylum Platyhelminthes
  • Flatworms
    • They have 1body opening.
    • Some reproduce asexually, others do so sexually.
    • Some are free living, but most are parasites that obtain food from their hosts.
phylum platyhelminthes1
Phylum Platyhelminthes
  • Planarians
    • NOT parasites, but it attacks animals smaller than itself.
    • Have eyespots
    • Live in water (free-living)
    • Known for ability to regenerate – ability to regrow body parts.
phylum platyhelminthes2
Phylum Platyhelminthes
  • Flukes
    • All are parasites
    • One can cause schistosomiasis
phylum platyhelminthes3
Phylum Platyhelminthes
  • Tapeworms
    • Use hooks to attach to intestines and then it absorbs food from the host’s digestive system.
    • They are parasites
    • Humans get from eating improperly cooked meat with larvae still in it.
    • Infect animals too (ex. Dogs)
phylum nematoda
Phylum Nematoda
  • Roundworms
    • Look like tiny strands of cooked spaghetti with pointed ends.
    • They have 2 body openings.
    • Have a one-way digestive system that is open at both ends (mouth and anus)
    • Most reproduce sexually
    • Some are parasites, but most are free-living.
phylum nematoda1
Phylum Nematoda
  • Parasitic roundworms include:
    • Trichinella:
      • Humans get from eating undercooked infected meat.
      • Form new cysts in muscles – cause pain
    • Hookworm:
      • Most are blood-sucking parasites
      • Attach to host’s intestines using hooks
phylum nematoda3
Phylum Nematoda
  • Other examples are filarial worms (cause elephantiasis) and ascarids.
  • Some roundworms are beneficial because they feed on insects that harm human property (crops)
    • One example is the c. elegans
phylum annelida
Phylum Annelida
  • Segmented Worm: Bodies have many linked sections called segments.
    • One-way digestive system with 2 body openings.
    • Use setae (little bristles on their bodies) to hold on to soil and help move.
    • Reproduce sexually
    • Closed circulatory system: blood moves through blood vessels.
phylum annelida1
Phylum Annelida
  • Segmented Worms
    • Marine Worms: live in saltwater
      • Also known as polychaetes
    • Leeches:
      • Most are blood-sucking parasites
      • Can be used for medical purposes
phylum annelida2
Phylum Annelida
  • Segmented Worms
    • Earthworms
      • In the digestive system, the crop is used for storage and the gizzard is used to grind soil and other materials.
      • Improve soil
      • They get oxygen through their skin (diffusion)
      • They can produce eggs and sperm in one body so they are called hermaphrodites
      • Have small brains and nerves throughout their bodies