The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a type of extinct invertebrate that lived in the seas of the early Cambrian period at a depth of up to 100 m. The Archaeocyathi had a calciferous, bowl- or horn-shaped, porous shell averaging 5–10 cm in length and 1.5 to 3 cm in diameter (but occasionally reaching 50 cm). More than 1,000 species are known; they are found in all parts of the globe. In the USSR they are found in the Urals, Siberia, and the Far East. They usually occur singly, more rarely in colonies. They led a sessile life, sometimes forming reeflike masses. Archaeocyathi are the predominant fossils in Lower Cambrian sedimentation.


Osnovy paleontologa. Vol. 2: Gubki, arkheotsiaty, kishech-nopolostnye, chervi. Moscow, 1962.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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