This list of the Paleozoic life of Iowa contains the various prehistoric life-forms whose
fossilized remains have been reported from
within the US state of
Iowa and are between 538.8 and 252.17 million years of age.
Reconstructive diagram (left) of a fossil (right) of the Ordovician sea urchin Bothriocidaris. The short spines which were attached to the tubercles are not drawn. †Bothriocidaris