Ajacicyathida is a prehistoric order of sponges in the class Archaeocyatha.

It was described in 1939, and is known from the Early Cambrian.

[1] In addition to the suborders Ajacicyathina, Dokidocyathina, and Erismacoscinina, the following genera are placed incertae sedis within Ajacicyathida:[1]

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