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Daspletosaurus torosus skeletal reconstruction.

By
Franoys
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11amnhaveragebiologybodybonescarnivorecarnivorouscomparedcomparisondaspletosaurusdiagramdinosaurdrawingfemurgiantgigantichornerihumanilustrationlargelengthlengthymalemasspaleontologypersonpredatorpredatoryreconstructionscalescaledsizeskelskeletalskeletonskulltheropodtonnestorosusuaosteologytyrannosauridaecoelurosauriapaleozoologytetanuraetyrannosauroideaholotype5438anaotomytyrannosaurinaepaleobiologyscalebarorionidestyrannoraptoraparartype

Description

The skeletal reconstruction of Daspletosaurus torosus holotype, described and named in Russel 1970. The holotype was described along two paratypes; AMNH 5438 and UA 11. All three specimens are of extremely similar size, with AMNH 5438 perhaps being marginally smaller than the other two. The remains of the stage 5 of growth of the recently described Daspletosaurus horneri (Carr et al 2017), suggest that it was the same size as theese 3 specimens, however, they aren't the largest speciemens of Daspletosaurus found so far; as Pete lll seems to be at least a bit larger than all of them. AMNH 5434; previously considered A.libratus, is a bit larger than the the holotype and the other two specimens, with perhaps a proportionally small forelimb, but still smaller than Pete lll. The femur circumference for AMNH 5438 is 390 mm, that of UA 11 is 415. Both femora are about 1000 mm long. With Campione & Evans bipedal regression, a mass of 2.8 t is obtained for AMNH 5438, and a mass of 3.4 t for UA 11.

Daspletosaurus coexisted with Albertosaurus libratus, which had a similar or slightly inferor body length; but had a proportionally smaller and frailer skull; with proportionally smaller and frailer teeth. On the other hand, Daspletosaurus vertebral centra is wider in proportion, and so is it's femur circumference suggesting a more massively built animal, however it's limb bones are shorter proportionally than those of Albertosaurus sarcophagus and libratus, so it is shorter legged in both absolute and proportional terms and therefore not as cursorial as they were.

Image used for reference for the posture: drive.google.com/open?id=19vRA…
Video of the ostrich moving, in case you are more insterested about the references: www.youtube.com/watch?v=KzjorJ…

Update: Updated the limbs, added a dorsal view; added mass estimation based on GDI volumetric estimate.

02/01/2019: Major update that includes an aesthetical update to the tail, an increased amount of intervertebral spacing, redrawing the dorsal series, and doing a ribcage in dorsal view more coherent with the size of the ribs. 

04/01/2019: Minor changes to the dorsal view and GDI updated.

Link to GDI result: cdn.discordapp.com/attachments…
Image size
9491x5605px 8.23 MB
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Verdugo286's avatar
Verdugo286
Edited

Can i ask you something about the shape of the posterior region of the skull, especially in its dorsal view? I do understand that you based your reconstruction from Russell (1970), however i have seen other authors (most notably Greg Paul) reconstructing the skull a bit differently than that of Russell (1970). For example, here is the reconstructed skull of the Russell (1970) specimen by Greg Paul in his book Predatory Dinosaurs of the World . Notice how Greg Paul reconstructed the dorsal view of the posterior region a bit wider than that of Russell (1970). Greg Paul has always been reconstructing Daspletosaurus's skull like that. Here is another reconstruction of his in the book Tyrannosaurus rex, the Tyrant King (Chapter 18)  . Another one from The Princeton Field Guide to Dinosaurs, he did not specify the specimen but the skull shape is still similar to those from his earlier books.