See text Archaeopriapulida is a group of priapulid worms known from Cambrian lagerstätte.

[3] The group is closely related to, and very similar to, the modern Priapulids.

[5] Despite a remarkable morphological similarity to their modern cousins,[6] they fall outside of the priapulid crown group, which is not unambiguously represented in the fossil record until the Carboniferous.

[7] In addition to well-preserved body fossils, remains of several archaeopriapulid taxa are known to have been preserved primarily as organic microfossils, such as isolated scalids and pharyngeal teeth.

[8][9][10] They are probably closely related or paraphyletic to the palaeoscolecids; the relationship between these basal worms is somewhat unresolved.