phylum annelida segmented worms n.
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PHYLUM ANNELIDA – segmented worms. Biology 112. Annelids. Representative species: common earthworm. Longest Earthworm found in Australia 12 feet long and thick as a coke can. Annelids. Have a coelom – fluid filled body cavity surrounded by a mesoderm (room for organs)

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  • Representative species: common earthworm

Longest Earthworm found in Australia

  • 12 feet long and thick as a coke can
  • Have a coelom – fluid filled body cavity surrounded by a mesoderm (room for organs)
  • Have a peritoneum (membrane in the coelom in which all organs are attached)
  • Have 2 sets of muscle tissue.
    • 1. body wall muscles – to move the worm and
    • 2. digestive system muscles to move food through the system
segmented worms
Segmented Worms
  • Tube within a tube digestive tract with food passing through mouth to anus
class oligochaeta earthworms
Class Oligochaeta: Earthworms

``It may be doubted whether there are any other animals which have played so important a part in the history of the world as the earthworm.``

-Charles Darwin, 1881

class oligochaeta earthworms1
Class Oligochaeta: Earthworms
  • 2500 species
  • Many more cell layers than flat and round worms
  • Have blood to carry gases to and from body tissues (circulation)
  • Blood in earthworms contains a red protein hemoglobin (just like in us!)
  • Have 5 hearts near the anterior end
class oligochaeta cont
Class Oligochaeta cont…
  • More complex digestive system than other worm phyla
  • They consume dirt (food and sand particles) via mouth, pharynx, esophagus and then stores it in the crop.
  • After storage, food moves to the gizzard to be ground down, then to the intestine for digestion and absorption into the blood stream.
  • Undigested food moves out the anus
class oligochaeta cont1
Class Oligochaeta cont…
  • Setae are bristles that aid in movement; each segment has 4 setae (except first and last ones)
  • Complex NS
  • Reproduce sexually
  • Hermaphrodites
other annelids
  • Class Hirudinea – leeches (blood sucking parasites)
class polychaeta marine worms
Class Polychaeta – marine worms

Family Nereididae

Planktonic Polychaete Worm


Terebellid Worm Larva (polychaete)

worm grunting charming
Worm Grunting/Charming

summary of earthworm
Summary of Earthworm
  • Movement
    • no skeleton; two layers of muscle
    • moves by setae; 4 per segment
  • Digestion
    • has true coelem
    • order is as follows mouth, pharynx, esophagus, crop, gizzard, anus
  • Nervous system
    • simple brain, nerve cord
  • Circulation
    • 5 hearts and blood vessels
  • Respiration
    • O2 in the skin; CO2 out the skin
  • Reproduction
    • Sexually; male and female parts (hermaphroditic)
  • Excretion
    • waste through nephridia that lead to pores in the skin
  • Symmetry – bilateral symmetry

Pictures for Lab

  • Practice Quiz - Online