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They can form large patches that are several tens of centimetres in diameter.
Encrusting sponges form a kind of crust on the substrate on which they live. This species varies from dark orange to red in colour. It is often found on the valves of sessile shellfish like spondylus or oysters, and is endemic to the Mediterranean.
Phylum: Porifera
Class: Demospongiae
Order: Poecilosclerida
Family: Myxillidae
Scientific name: Crambe crambe
French: Eponge encroûtante orange-rouge
Spanish: Esponja encrostante roja-anaranjada
Italian: Spugna dello spondilo
German: Orangeroter Krustenschwamm