The Protostomate Phyla

1
The Protostomate Phyla

• Annelida
• Mollusca
• Arthropoda

2
Phylum Annelida

• Segmented worms
• True body cavity
• Paired Protonephric excretory organs
• Paired ganglia with interconnecting nerves
• Complete digestive tract

3
Classes of Annelida

• Oligochaeta-few bristles
• earthworms
• Polychaeta--many bristles, parapodia
• Hirudinea--leeches
• Fusion of segments is called tagmatamization