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Agelas flabelliformis
''Agelas flabelliformis'', also known as the elephant ear sponge, is a species of demosponge. It takes the form of a large leathery slender flap and is found in the Caribbean area at depths down to .
==Description==
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 in diameter. It is usually less than thick but may reach a height and width of a metre (yard) or so. There is often a central lobe with two side flaps. The consistency is firm and leathery but also fragile. On one side it has many large, circular osculi (holes) scattered across the surface. On the other side are small pores and a few, widely dispersed, irregular osculi and some groups of smaller ones. Each vent is surrounded by a collar or rim of thickened skin. The tissue forming the sponge is strengthened by the incorporation of a single type of mineralised spicule. These spicules are classified as acanthostyles and consist of curved rods, with one end pointed and with whorls of spines on the shaft. The spicules are embedded in the sponge's tissues where they form a mesh-like, interlocking skeleton. The colour of this sponge is yellowish-brown, fawn or dark brown, sometimes with pale edges and it is said to resemble a piece of tanned cow-hide. It is similar in appearance to ''Agelas dispar'' but can be distinguished from that species by the size and shape of the spicules in its skeleton.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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