| Aspect: | Grey-white semi-circular curled white blades. |
| Population: | Common. |
| Notable feature: | Blades horizontally crossed by darker lines. |
| Environment: | Usually found in shallow, quiet waters. |
| Behaviour: | - |
| Aspect: | Grey-white semi-circular curled white blades. |
| Population: | Common. |
| Notable feature: | Blades horizontally crossed by darker lines. |
| Environment: | Usually found in shallow, quiet waters. |
| Behaviour: | - |