 I. lakotaensis was described by David B. Weishampel and Philip R. Bjork in 1989 . The only well @-@ accepted North American species of Iguanodon , I. lakotaensis was described from a partial skull from the Barremian @-@ age Lower Cretaceous Lakota Formation of South Dakota . Its assignment has been controversial . Some researchers suggest that it was more basal than I. bernissartensis , and related to Theiophytalia , but David Norman has suggested that it was a synonym of I. bernissartensis . Gregory S. Paul has since given the species its own genus , Dakotadon . 
 I. lakotaensis was described by David B. Weishampel and Philip R. Bjork in 1989 . The only well @-@ accepted North American species of Iguanodon , I. lakotaensis was described from a partial skull from the Barremian @-@ age Lower Cretaceous Lakota Formation of South Dakota . Its assignment <a href='uninflect' title='1'><mark>has</mark></a> been controversial . Some researchers suggest that it was more basal than I. bernissartensis , and related to Theiophytalia , but David Norman <a href='been_done' title='2'><mark>has</mark></a> suggested that it was a synonym of I. bernissartensis . Gregory S. Paul <a href='been_done' title='3'><mark>has</mark></a> since given the species its own genus , Dakotadon . 
I. lakotaensis was described by David B. Weishampel and Philip R. Bjork in 1989 . The only well @-@ accepted North American species of Iguanodon , I. lakotaensis was described from a partial skull from the Barremian @-@ age Lower Cretaceous Lakota Formation of South Dakota . Its assignment have been controversial . sum researchers suggest dat it was more basal den I. bernissartensis , and related to Theiophytalia , but David Norman done suggested that it was a synonym of I. bernissartensis . Gregory S. Paul done since given da species its own genus , Dakotadon .