Dakotadon

Dakotadon is a genus of iguanodont dinosaur that roamed the Earth during the Early Cretaceous period. The name "Dakotadon" translates to "Dakota tooth," a clear reference to both the geographic location of its discovery in South Dakota, USA, and its characteristic dental features. This dinosaur is primarily known from a partial skull, along with some associated skeletal remains, including lower jaws and vertebrae.

History and Classification

The fossils were first unearthed in the Lakota Formation of South Dakota. Initially, in 1989, the species was described by David B. Weishampel and Philip R. Bjork as Iguanodon lakotaensis, recognizing its distinctiveness from other known Iguanodon species. However, its placement within the Iguanodon genus has been a subject of scientific debate. Some researchers have suggested that Iguanodon lakotaensis was more primitive and distinct than Iguanodon bernissartensis, and potentially related to the genus Theiophytalia. Conversely, other paleontologists, such as David Norman, have proposed that it might be a synonym of Iguanodon bernissartensis, suggesting a wider geographic distribution for that species.

In 2008, paleontologist Gregory S. Paul revised the classification of iguanodont species and proposed establishing a new genus for Iguanodon lakotaensis, naming it Dakotadon. Paul's assessment placed Dakotadon as a more basal iguanodont, situated outside the families Iguanodontidae and Iguanodontoidea. This reclassification highlights the ongoing scientific effort to accurately understand the evolutionary relationships and diversity of these ancient herbivores.

Paleobiology and Discovery

Gregory S. Paul estimated Dakotadon to have reached a length of approximately 6 meters (20 feet) and a body mass of about 1 metric ton (1.1 short tons). As an iguanodont, Dakotadon is presumed to have been a herbivore, feeding on plant material. The discovery of a relatively complete skull provided valuable insights into its cranial anatomy, although further research continues to refine our understanding.

The type specimen, SDSM 8656, was found north of Sturgis, South Dakota, within the Lakota Formation. The age of the specimen was refined through later research, with efforts to relocate the type locality and measure the stratigraphy suggesting a late Valanginian to early Barremian age, placing it earlier than some previous estimates. This makes Dakotadon one of the most complete Early Cretaceous dinosaur discoveries from the Black Hills region of South Dakota.