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cloud sponge
Cloud sponge ''(Aphrocallistes vastus)'' is a primitive organism of the order Hexactinosida in the class Hexactinellida.〔(【引用サイトリンク】title=''Aphrocallistes vastus'' (cloud sponge) )〕 It is a deep-water reef-forming animal. The species was first described by F.E. Schulze in 1886.〔
==Description==
The cloud sponge takes the form of a large cup with an irregularly folded wall about thick. This is pierced by many pores about wide and covered by a thin dermal membrane. The skeletal elements form a lattice-like structure made up of fused spicules of silica. These mesh together and project into the adjoining canals. There is a fir-tree like concentration of spicules running through the body wall with the branches either having rounded or knobbly ends.
The form of the sponge varies according to the location in which it is found. It often has a mitten-like structure or may be tall and cylindrical or bowl-like but in areas with strong currents can be dense and compact.
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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