Anelida

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Anelida
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3 classes

• Oligochaeta earthworms
• Polychaeta Marine (Polychaeta) worms
• Hirudinae- Leeches

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Annelids Segmented worms

• Euceolomate Protostomate
• Monecious
• Closed circulatory system
• Metanephridia nephrostomes
• Ventral nerve cord, Dorsal brain
• Segmented

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Nervous SystemDorsal Brain Ventral Nerve cord
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(Eu) Ceolomate- Protostomate
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Polychaete Worms

• Marine
• Parapodia felshy extensions
• Highly Cephalized
• Carnivorous
• Retractable pharynx / mouth
• BITE!!
• Eaten by hydroids etc. link in food chain

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Nereis Head
G
G) Denticles
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37 Parapodia
Notopodium
Bristles / Setae
Neuropodium
Parapodium
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Parapodia
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HirudineaLeeches
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OligochaetesEarthworms
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SLIDE 38
Metanephridia
Ceolom
Peritoneum
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HirudineaLeeches
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