Close up, it is visibly structured, resembling a "madrepore" (stone coral, Scleractinia ) colony. From this, it derives its name.
Kaynak: Madreporite

There are said to be oversized madrepore species growing in turbid waters, according to diving reports. References : New Caledonia
Kaynak: Prony Bay

(sea anemones, madrepore and corals).A clear example is the "forest" of yellow and red gorgonie Paramuricea clavata These, joining to the
Kaynak: Marine Life of the Straits of Messina