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The teeth of spinosaurids were conical, with an oval to circular cross section and either absent or very fine serrations. Their teeth ranged from slightly recurved, such as those of Baryonyx and Suchomimus, to straight, such as those of Spinosaurus and Siamosaurus, and the crown was often ornamented with longitudinal grooves or ridges. [35] [38]
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 ...
In this study, the teeth of Siamosaurus and a Moroccan spinosaurid were compared to those of crocodilians using scanning electron microscopy. Lauprasert found that spinosaurids and crocodilians may have employed similar feeding tactics and been under comparable mechanical constraints, based on resemblances in the microstructure of their tooth ...
The tip of the snout was enlarged sideways and carried a "terminal rosette" of longer teeth, seven per side in the premaxillae and about the same number in the corresponding part of the lower jaw. Further back, there were at least 22 teeth per upper jaw side in the maxilla, while the entire lower jaw side carried 32 teeth in the dentary bone. [1]
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.
Baryonychinae is an extinct clade or subfamily of spinosaurids from the Early Cretaceous of Europe and West Africa.The clade was named by Charig & Milner in 1986 and defined by Sereno et al. in 1998 and Holtz et al. in 2004 as all taxa more closely related to Baryonyx walkeri than to Spinosaurus aegyptiacus.
The tips of spinosaurids' upper and lower jaws fanned out into a rosette-like shape that bore long teeth, behind which there was a notch in the upper jaw; this formed a natural trap for prey. [10] Like those of other spinosaurids, Ichthyovenator ' s straight, unserrated teeth [ 5 ] would have been suitable for impaling and capturing small ...
English: Scale chart of six spinosaurid species compared with a human (Ernst Stromer). References: Spinosaurus: Francisco Bruñén (2019) and Ibrahim et al. (2020) Oxalaia: Kellner et al. (2014) for Oxalaia's remains, most of anatomy based on Spinosaurus via Ibrahim et al. (2020) Suchomimus: Francisco Bruñén (2019) Baryonyx: Scott Hartman (2018)