PHYLUM ANNELLIDA
Phylum Annellida Classification
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Contain circular rounded long body (bilaterally
symmetrical)
Segmented
Has no respiratory organs
Has a closed circulatory system
DIGESTIVE SYSTEM
Annelids Digestive system is basic
 Contains a mouth which swallows food
 Goes through crop and gizzard
 Then the intestines that lead to the anus
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CIRCULATION SYSTEM
Blood carried through annilids contain
hemoglobin
 It’s a closed circulation which means its in well
developed blood vessels
 Has 5 hearts/Aordic Arches
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RESPIRATORY SYSTEM
Annelids do not contain lungs or organs to help
them breath
 Breath through their skin
 Lets out carbon dioxide through skin
 Oxygen can be transported to blood
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DISSECTION : EARTHWORM
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Have your worm look like this
DISSECTION : EARTHWORM
External
Mouth: Eats food
Setae: Helps the worm
move through the
ground
Sperm Duct: Where
sperms are released
Clitellum: where eggs
are held and released
for reproduction
DISSECTION : EARTHWORMS
Internal
thin
Brain: what do you
think it does?
food
Pharynx: Swallows
food
food
Esophagus: moves
food to crop, gizzard
stor
Seminal Vesicles:
stores sperms
Aortic Arches: hearts
Nephridia: Like a
kidney
Crop: Stores food
Intestines: transfers
Gizzard: Grinds up food
nutrients
Nerve Cord: Sensors and receptors