Mesohyl

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Bath sponge (Spongia officinalis)

With mesohyl refers to a special form of extracellular matrix in sponges (Porifera).

Sponges are metazoa , that is, multicellular animals. However, since their cells are only loosely organized associations and thus do not represent real tissue, they are assigned to the Parazoa . In contrast to tissue animals, they have no organs. Specialized cells ( sclerocytes and collencytes ) produce skeletal needles ( sclerite , called spicula ) and a collagen-like protein ( spongin ), which is strongly linked in the mesohyl. When the sponges dry out and after the animals die, the spongin matrix is ​​retained and can be used commercially as a bath sponge for some types of horned sponges ( Dictyoceratida ) .