New material attributable to Deltasuchus motherali, a neosuchian from the Cenomanian of Texas, provides sampling across much
of the ontogeny of this species. Detailed descriptions provide information about the paleobiology of this species, particularly
with regards to how growth and development affected diet. Overall snout shape became progressively wider and more robust with
age, suggesting that dietary shifts from juvenile to adult were not only a matter of size change, but of functional performance
as well. These newly described elements provide additional characters upon which to base more robust phylogenetic analyses.
The authors provide a revised diagnosis of this species, describing the new material and discussing incidents of apparent
ontogenetic variation across the sampled population. The results of the ensuing phylogenetic analyses both situate Deltasuchus
within an endemic clade of Appalachian crocodyliforms, separate and diagnosable from goniopholidids and pholidosaurs, herein
referred to as Paluxysuchidae. This title is also available as Open Access on Cambridge Core.