• Archaeocyatha is an extinct group of sponge-like organisms that are found in Lower and Middle Cambrian strata. They are usually classified with the sponges in the phylum Porifera.

• Archaeocyatha were sessile organisms that built complex, vase-like structures out of calcite. The structures resembled a pair of concentric rings.

• These organisms were widespread and diverse, with hundreds of different known species.

• The presence of Archaeocyatha in sedimentary rocks can also help geologists determine the geological level and depositional environment of ancient formations.

• Their name, Archaeocyatha, means "ancient cup" in Greek, describing their characteristic shape of a double-walled cup.