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Anthocyathea (Irregulares; phylum Archaeocyatha) A class of solitary, rarely colonial organisms found in Lower, Middle, and Upper Cambrian rocks. The conical cup is from cylindrical to discoid in outer form, often with an irregular outline, having one, or more usually two, porous walls. The intervallum contains rods and bars or septa, always with dissepiments and commonly with tabulae.

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Anthocyathea See IRREGULARES.

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