Spongin

Spongin is a type of collagen protein that forms the fibrous skeleton of most organisms among the Phylum Porifera, the sponges.

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Spongin does not make up spicules. Spicules can be calcareous or siliceous depending on taxonomic Class; spicules form the rigid skeleton of sponges (Phylum Porifera) as well as offer protection from predation. Spongin is a protein made of modified collagen, it gives a sponge its flexibility.