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The Therrien and Henderson study has been criticized for the choice of theropods used for comparison (e.g., most of the theropods used to set the initial equations were tyrannosaurids and carnosaurs, which have a different build than spinosaurids), and for the assumption that the Spinosaurus skull could be as little as 1.5 m (4 ft 11 in) in length.
Annotated skull diagram of Spinosaurus. Spinosaurid skulls—similar in many respects to those of crocodilians—were long, low and narrow. [17] As in other theropods, various fenestrae (openings) in the skull aided in reducing its weight. In spinosaurs however, the antorbital fenestrae were greatly reduced, akin to those of crocodilians. [30]
Spinosaurus skull in Ukrainian. SVG development . The SVG code is . This diagram was created with Inkscape. Based on sketch from dal Sasso, C.; Maganuco, S ...
Since little was known of Spinosaurus ' s skull at the time, these similarities were enough for the authors to suggest a possible junior synonymy of Irritator with Spinosaurus. Sues and colleagues noted that more overlapping skull material was needed for further diagnosis. [7]
Suchomimus tenerensis skull reconstruction at the Australian Museum, Sydney. Unlike most giant theropod dinosaurs, Suchomimus had a very crocodilian-like skull, with a long, low snout and narrow jaws formed by a forward expansion of the premaxillae (frontmost snout bones) and the hind branch of the maxillae (main upper jaw bone).
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Based on skeletal material from related spinosaurids, the skull of Oxalaia would have been an estimated 1.35 metres (4.4 feet) long; [5] this is smaller than Spinosaurus 's skull, which was approximated at 1.75 m (5 ft 9 in) long by Italian palaeontologist Cristiano Dal Sasso and colleagues in 2005. [20]
Neck reconstructions of Sigilmassasaurus (top) and Baryonyx. The validity of Sigilmassaurus, however, did not go unchallenged shortly after it was named.In 1996, Paul Sereno and colleagues described a Carcharodontosaurus skull (SGM-Din-1) from Morocco, as well as a neck vertebra (SGM-Din-3) which resembled that of "Spinosaurus B," which they therefore synonymized with Carcharodontosaurus. [11]