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Calcarean Sponges (Calcarea)

      The Class Calcarea (Calcarean Sponges) differs from other classes by the mineralisation of the spicules, which are not formed by opal but by calcium carbonate (calcite, rarely by aragonite or by magnesium-rich calcite). The spicules are monoaxial, triradial or tetraradial.

Autor: Radek Vodrážka
Amphitelion tenue p4353
Astraeospongium JK11328
Pachytilodia bohemica p3919
Peronidella fruticosa p3916
Sphinctozoa HF2435
Sphinctozoa HF1268
Stellispongia depressa p3915
Stellispongia tuberosa p5407

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]