Stovepipe Sponge

Aplysina archeri (also known as stove-pipe sponge because of its shape) is a species of tube sponge that has long tube-like structures of cylindrical shape. Although they can grow in a single tube, they often grow in large groups of up to 22 tubes. A single tube can grow up to 5 feet (1.5 m) high and 3 inches (7.6 cm) thick. T... Read more in Seabook