Phylum Annelida: segmented worms (O and A-level biology)

Phylum Annelida: segmented worms

E.g. earthworm, leech, lungworm

Characteristics of segmented worms

• Has segmented body
• It is hermaphrodite
• Has a complete digestive system
• Its excretory organ is called nephridia
• Gaseous exchange occurs over the body
• Uses chaeta for locomotion

Economic importance of earthworms

• Tunnels improve aeration and drainage of the soil
• causes decay and formation of humus
• source of food to other animals e.g. chicken
• die and rot to form manure.
• Mixes soil layer

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Compiled by Dr. Bbosa Science