Habitat 
Depth 
Group 
Role WHAT DOES IT LOOK LIKE?
Its strong shell coils into a low spiral and is wider than it is tall. It measures around five centimetres high and six across, with larger individuals occurring. Juveniles often have clearer spiny projections than adults.
Attached organisms frequently hide the brown to greenish colour. The rounded opening is pearly. The operculum, a thick calcareous piece carried on the foot, has a pinkish-orange outer face and closes the entrance when the body withdraws.
WHERE DOES IT LIVE?
The snail uses algae-rich rocks, Neptune-grass meadows and coralligenous seabeds, structures partly built by lime-producing algae. Records range from a few metres to around a hundred.
Algae and small organisms colonising the shell blur its outline. A living individual may therefore blend into its support.
WHAT DOES IT EAT?
It is herbivorous, mainly grazing soft algal parts. Its radula, a band with many microscopic teeth, removes food from surfaces.
The foot provides movement during feeding. The snail therefore uses seabed algae rather than filtering particles from water.
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