Topic summary
Spinosaurinae
Extracted from the Wikipedia article Spinosauridae.
Classification
Traditionally, Spinosauridae is divided into two subfamilies: Spinosaurinae, which contains the genera Icthyovenator, Irritator, Oxalaia, Sigilmassasaurus and Spinosaurus, is marked by unserrated, straight teeth, and external nares which are further back on the skull than in baryonychines, and Baryonychinae, which contains the genera Baryonyx, Cristatusaurus, Suchosaurus, Suchomimus, Ceratosuchops, and Riparovenator, which is marked by serrated, slightly curved teeth, smaller size, and more teeth in the lower jaw behind the terminal rosette than in spinosaurines. Others, such as Siamosaurus, may belong to either Baryonychinae or Spinosaurinae, but are too incompletely known to be assigned with confidence. Siamosaurus was classified as a spinosaurine in 2018, but the results are provisional and not entirely conclusive.