Picture that illustrates the biodiversity that can be found in an area of approximately 10 cm2. Among the most visible groups, bivalves (Isognomon bicolor) and various species of sea squirts, sponges and bryozoans are the ones that stand out.
Colonial ascidian occupying large extensions of vertical walls. Sea squirts are filter feeding organisms that feed on organic particles in suspension. The oral and atrial siphons, through which water enters and leaves, respectively, are clearly visible for each zooid.