1. Single radiole with rachis (near bottom) supporting pinnules.
2. Scanning electron micrograph (SEM) of pinnules.
3. SEM of frontal food groove with long (fronterolateral) cilia and short groove cilia.
4. Diagram of pinnule cross section.
5. Diagram of food sorting mechanism in food groove.
6. Transmission electron micrograph (TEM) of epithelial gland cell.
7. Longitudinal TEM micrograph of pinnule showing glandular epithelium and cellular cartilage.
8. TEM of non-glanular epithelium. Dark bodies are pigment granules.
9. TEM of cellular cartilage and chondrocyte, the cell that forms the cartilage.
10. Oblique TEM of frontal food groove.
11. TEM of grouped fronterolateral cilia.