A deep-water sponge which has a skeleton of intricately shaped spines of silica that may fuse to form a filmy lattice with a glass-like appearance. See also Venus's flower basket.
- Class Hexactinellida.
- Because it looks like it is woven from glass it is sometimes called a glass sponge.
- The hard component was often formed from calcium carbonate, as found in shellfish, but other durable defences were provided by chitin (a complex carbohydrate), in crustaceans and insects, and even silica, in the glass sponges.
- It is upon close internal examination that glass sponges can be most easily distinguished from other sponges.
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