Agelas Flabelliformis
The elephant ear sponges takes the form of a big leathery flap and is found in the Caribbean as deep as 330 feet. The flap is usually less than 1.2 inches thick but can grow up to a yard in width and height. There is often a central lobe with two side flaps. The tissue forming the sponge is strengthened by the use of a single type of mineralised spicule. These are classified as acanthostyles and consist of curved rods. These spicules are embedded in the sponge's tissues where they form a mesh-like skeleton.