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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]
This diagram was created with Inkscape. ... "New information on the skull of the enigmatic theropod Spinosaurus, with remarks on its sizes and affinities".
Annotated diagram of the reconstructed skull Annotated diagram of the reconstructed skull muscles of Spinosaurus. Its skull had a narrow snout filled with straight conical teeth that lacked serrations. There were six or seven teeth on each side of the very front of the upper jaw, in the premaxillae, and another twelve in both maxillae behind ...
Diagram illustrating skull elements from Irritator (bottom) and other spinosaurids, comparing the relative positions of the external nares, or bony nostrils, (labeled e.n.) In 1998, Sereno and colleagues defined two subfamilies within the Spinosauridae based on craniodental (skull and tooth) characteristics.
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]
Annotated skull diagram of the related Spinosaurus. In 2006, Thai biologist Komsorn Lauprasert examined fossils collected from the Phu Kradung, Sao Khua, and Khok Kruat Formations. In this study, the teeth of Siamosaurus and a Moroccan spinosaurid were compared to those of crocodilians using scanning electron microscopy.
A nearly complete skull fossil found in Egypt has revealed a new species of Hyaenodonta, an apex carnivore that mysteriously went extinct about 25 million years ago.
Massospondylus Skull Diagram; Melanorosaurus readi; parasaurolophus Head; Parksosaurus; Prosaurolophus Head; Rinconsaurus image and size comparison diagram. Skeletal diagram of known portions here; Spinosaurus skull reconstruction