• Title
• Copyright
• Evolution of polychaete buccal organs
• Polychaete feeding methods
• Introduction to ventral buccal organs
• Muscular ventral buccal organ A
• Muscular ventral buccal organ B
• Simple_ventral_buccal organ
• Introduction to axial_proboscis
• Simple_axial_proboscis
• Muscular_axial_proboscis
• Buccal_organ_absent
• Symbiosis
• Acknowledgements and References

Arenicola

Arenicola (Arenicolidae) with papillated pharynx everted for ingesting sand.

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