Spinosaurus - Classification

Classification

Cladograms of the Spinosauridae
showing the position of Spinosaurus
Spinosauridae


Baryonyx


Suchomimus




Irritator


Spinosaurus



Sources: Sereno et al. (1998), Pisani et al. (2002), and Benson (2010)
Spinosauridae


Baryonychinae




Irritator


Spinosaurus



Source: Holtz et al. (2004), who coded Baryonyx and Suchomimus "as a single taxon" because they were "nearly identical"

Spinosaurus gives its name to the Spinosauridae family of dinosaurs, which includes two subfamilies: Baryonychinae and Spinosaurinae. The Baryonychinae include Baryonyx from southern England and Suchomimus from Niger in central Africa. The Spinosaurinae include Spinosaurus, Irritator from Brazil, and Angaturama (which is probably synonymous with Irritator) from Brazil. The Spinosaurinae share unserrated straight teeth that are widely spaced (e.g., 12 on one side of the maxilla), as opposed to the Baryonychinae which have serrated curved teeth that are numerous (e.g., 30 on one side of the maxilla).

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