![]() The tissue forming the sponge is strengthened by the incorporation of a single type of mineralised spicule. Each vent is surrounded by a collar or rim of thickened skin. On the other side are small pores and a few, widely dispersed, irregular osculi and some groups of smaller ones. On one side it has many large, circular osculi (holes) scattered across the surface. The consistency is firm and leathery but also fragile. ![]() There is often a central lobe with two side flaps. It is usually less than 3 centimetres (1.2 in) thick but may reach a height and width of a metre (yard) or so. The elephant ear sponge consists of a large thin flap of spongy material attached edgewise to the substrate by a short peduncle or stem about 4 centimetres (1.6 in) in diameter. It takes the form of a large leathery slender flap and is found in the Caribbean area at depths down to 100 metres (330 ft). ![]() Agelas flabelliformis, also known as the elephant ear sponge, is a species of demosponge. ![]()
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