Glass sponges (Hexactinellida)

Glass sponges - class Hexactinellida are typical by tri-axial (triaxonn) spicules, composed of opal (in the fossil record by SiO2).

Author: Radek Vodrážka

Virtual museum of the Czech Geological Survey, cgs.gov.cz, (C) Czech Geological Survey, 2011, v.1.1 [14.4.2026]