...their surveys, at in length and upwards of in weight. In 1988, Gregory Paul also listed it as the longest theropod at, but gave a lower mass estimate of . The Dal Sasso et al. estimates were criticized because the skull length estimate was uncertain, and scaling Suchomimus which was long and in mass to the range of estimated lengths of Spinosaurus would produce an estimated body mass of . François Therrien and Donald Henderson, in a 2007 paper using scaling based on skull length, challenged previous estimates of the size of Spinosaurus, finding the length too great and the weight too small. Improvement of the precision of size estimates for Spinosaurus requires the discovery of more complete remains as available for some other dinosaurs, especially the limb bones of Spinosaurus which are "hitherto unknown". The neural spines were slightly longer front to back at the base than higher up, and were unlike the thin rods seen in the pelycosaur finbacks Edaphosaurus and Dimetrodon, contrasting also with the thicker spines in the iguanodontian Ouranosaurus. The following cladogram shows an analysis of Tetanurae simplified to show only Spinosauridae from Allain et al. : Discovery and...
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