Phylum Annelida

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Phylum Annelida

• Segmented Roundworms

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3 Classes of Annelids

• Polychaeta
• Oligochaeta
• Hirudinea

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Common Characteristics in all Annelids

• Unidirectional Digestive System
• Closed Circulatory System
• First sign of a heart-like structure
• Nephridia used for excretion
• Primitive Brains present

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Class Oligochaeta

• Earthworms Freshwater worms
• Terrestrial
• Breathe through skin
• Aquatic
• Gills

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Internal Anatomy
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Phylum Annelida Class Hirudinea
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Class Hirudinea

• Commonly known as the LEECHES
• Fresh and saltwater species (300)
• Few land species

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Leeches

• Hirudin anti-coagulating chemical is used to
  keep hosts blood flowing
• Used for medicinal purposes

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Class Polychaeta

• Mainly marine worm
• Have appendages
• Show cephalization

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More Polychaetes