Giant barrel sponge Sponges. Huge barrel-shape with rough, often jagged, stone-hard exterior. Shades of gray, brown or red-brown. Generally solitary, but one or two smaller individuals occasionally grow around base. Lees meer
Social feather duster Bristle worm. Saltwater. Feather Duster Worms. This species lives on the reef, usually where some current occurs.They grow as a mass of individual small tubeworms, sometimes totaling over 100 individuals in a single clump. Lees meer