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inner collar cell and outer cell
sponge cells (2)
Hexactinellida
glass sponge, silica spicules
Calcarea
sponge type, calcite
Archaeocyathid
demosponge, made of calcite, 1st reef builder as framework
Chaetetid
Demospongea, aragonite, major in Pennsylvanian period
Stromatoporoid
Demosponge, calcite, has laminea, pillars, mamelons, big in Silurian and Devonian era
Clinoid
Demosponge, bore into calcite, bioeroders