Irregulares
Probably paraphylletic or polyphylletic group of archaeocyathids with irregular shape of the skeleton.
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Česky 
Virtual museum of the Czech Geological Survey, cgs.gov.cz, (C) Czech Geological Survey, 2011, v.1.01 [29.09.2025]
Irregulares
Probably paraphylletic or polyphylletic group of archaeocyathids with irregular shape of the skeleton.
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