different annelida classes

• POLYCHAETA

  ✓ Largest annelid class

  ✓ Mostly marine organisms

  ✓ Head with eyes and tentacles

  ✓ Parapodia bear numerous setae

  ✓ Monoecious or dioecious
• POLYCHAETA

  example:

  Scientific name: Nereis virens

  Common name: Clamworm
• CLITELLATA

  Subclass: Oligochaeta

  ✓ No parapodia. Few setae

  ✓ No distinct head

  ✓ Found in freshwater or terrestrial

  ✓ Clitellum: For cocoon formation
• CLITELLATA

  Subclass: Oligochaeta
• CLITELLATA

  Subclass: Oligochaeta

  example:

  Scientific name: Lumbricus Terrestris.

  Common name: Earthworm
• CLITELLATA

  Subclass: Hirudinea

  ✓ Bodies with 34 segments

  ✓ Posterior and anterior suckers

  ✓ Setae reduced or absent

  ✓ Found in freshwater, marine and terrestrial
• CLITELLATA

  Subclass: Hirudinea

  example:

  Scientific name: Hirudo medicinalis

  Common name: Medicinal leech