A genus of extinct cup-shaped marine organisms from the Cambrian period that formed early reef structures in ancient oceans.
From Greek 'archaios' meaning 'ancient' and 'cyathus' meaning 'cup'. The singular form describes a specific genus within the Archaeocyathidae family.
Individual Archaeocyathus organisms looked like tiny perforated cups attached to the ocean floor—thousands of them clustering together created the Cambrian's first large-scale reef ecosystems, basically inventing marine architecture.
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