a particularly large mandibular fragment from a "d. riograndensis" specimen was estimated to have come from an individual with a skull length of . this length was used in conjunction with a regression equation relating skull length to total length in the american alligator to estimate a total length of for this particular specimen. this is only slightly lower than previous estimates for the species. "deinosuchus" has often been described as the largest crocodyliform of all time. however other crocodyliformes such as "purussaurus", "rhamphosuchus", and "sarcosuchus" may have equaled or exceeded it in size.