| Aspect: | Generally a green body and head with more or less visible cirri above the eyes . Large squarish mouth |
| Population: | Common. |
| Notable feature: | Prominent globular eyes with either lighter green or yellow surround. |
| Environment: | Any tiny hole in a rock or coral boulder, but also an uninhabited barnacle, may provide a useful home. |
| Behaviour: | Generally only shows its head, but will retreat completely if approached too briskly. |