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Irregulares (Anthocyathea; phylum Archaeocyatha) Class of solitary, rarely colonial invertebrate animals 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. Compare REGULARES.

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Irregulares See ANTHOCYATHEA.

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