6.1 History
6.2. General considerations
6.3. The oikopleurid house
    6.3.1. Anatomy
    6.3.2. Function
    6.3.3. Secretion
    6.3.4. Inflation frequency
    6.3.5. Inflation process
    6.3.6. Chemical composition
6.4. The fritillariid house
6.5. Other appendicularian houses
6.6, Ecological impact of appendicularian houses
6.7. Preservation of appendicularian houses
6.8. Acknowledgements