Coelosclerithophorans

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A polyphyletic group of sclerites which are all characterised by having hollow sclerites made of calcium carbonate, possibly aragonite.

There are two monophyletic groups within the coeloscleritophorans; the Sachitids which Halkieria and Wiwaxia belongs to and the Chancellorids.

These are common constituents of Lower Cambrian small shelly fossil assemblages.