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| Population: | Occasional. | 
| Notable feature: | . | 
| Environment: | Often found on long immersed mooring lines. | 
| Behaviour: | . | 
| Aspect: | Relatively short white spines over brown body. The black elements on some of the pictures are erect podia. | 
| Population: | Common. | 
| Notable feature: | - | 
| Environment: | Shallow waters of bays, on sea grass beds at depths of 10 metres maximum. | 
| Behaviour: | - | 
| Aspect: | Looks like a very large unattractive rubbery cucumber, but generally of various shades of brown, from light to dark brown with knob-shaped podia of opposite brown tone (or even yellow). | 
| Population: | Common. | 
| Notable feature: | Thus called due to its three rows of podia on its "sole", as can be seen on one of the pictures below. | 
| Environment: | Sandy and grassy bottoms. | 
| Behaviour: | - |