However, the largest fragmentary remains of D. riograndensis were 1.5 times the size of those of the average D. rugosus and it was determined that the largest individuals of this species may have been up to 12 m (39 ft) in length and perhaps weighed as much as 8.5 t (9.4 short tons).
Porén, os restos fragmentarios máis grandes de D. riograndensis eran de 1,5 veces o tamaño da media de D. rugosus e determinouse que os individuos máis grandes desta especie podían chegar a 12 m e quizais pesaban 8,5 toneladas.