Phylum Annelida

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7 Terms

1
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Annelids

  • Triploblastic

  • coelomates

  • segmented

  • have metamers → locomotion and allowed an increase in size WITHOUT and increase in complexity

  • closed circulation

  • chaetae → can take many different forms, can be venomous

  • hydrostatic skeleton → coelom

2
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how does the earthworm move due to the hydrostatic skeleton

  • peristaltic-like movement

3
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Hydrostatic Skeleton - Know how it works (nd revision)

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Groups of the Annelids

  • Polychaeta

  • Oligochaeta

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Polychaetae

  • chaetae are located on the parapodia (fleshy outgrowths)

  • cephalization - predators which actively pursue their prey

  • cephalic chaetae can be modified to form grasping claws

  • ragworms, fan worms

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oligochaeta

  • never located on parapodia

  • poor cephalization - burrow in soil

  • earthworms

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how are earthworms beneficial

  • burrow in the soil - aerate

  • droppings help fertilize

  • facilitate leaf decomposition