In 2017, Brazilian palaeontologists Marcos Sales and Cesar Schultz suggested that the various Asian teeth might eventually be attributed to Ichthyovenator-like forms. The researchers accepted Siamosaurus as a spinosaurid, but stated that its teeth and those of "S." fusuiensis are too similar to those of other Early Cretaceous spinosaurids to erect new taxa unequivocally; and thus considered both taxa as dubious. Carrano and colleagues noted that the Khok Kruat skeleton may provide answers to their identification. Authors such as Milner and colleagues in 2007, Bertin Tor in 2010, Holtz in 2011, and Kamonrak and colleagues in 2019 regarded the Khok Kruat skeleton as first definitive evidence of spinosaurs in Asia. In 2012, French palaeontologist Ronan Allain and colleagues described a partial skeleton from the Grès supérieurs Formation of Laos, and used it to name the new spinosaurid genus and species Ichthyovenator laosensis. They considered it the first definitive evidence of spinosaurids in Asia, in light of the debated identity of Siamosaurus and "S." fusuiensis. In a 2014 abstract, Allain announced that further Ichthyovenator material, including three teeth, had been excavated. Typically of spinosaurines, Ichthyovenators teeth bore straight and unserrated crowns, though no comparison was made to the other Asian teeth. The taxonomic and phylogenetic affinities of the Spinosauridae are subject to active research and debate, given that in comparison to other theropod groups, many of the family's taxa are based on poor fossil material. Traditionally, the group is split into the subfamilies Spinosaurinae (unserrated, straight teeth with well marked flutes and more circular cross-sections) and Baryonychinae (finely serrated, somewhat recurved teeth with weaker flutes and a more oval cross-section). Since spinosaurines were, on average, larger animals than baryonychines, their teeth were also generally larger. The morphological variation seen in spinosaurid teeth, however, has shown that the aforementioned characteristics are not always consistent within the subfamilies. Likewise, the Khok Kruat skeleton shares mixed characteristics between Baryonyx and Spinosaurus, and its precise phylogenetic placement is uncertain pending a description of the material. The possibility that Baryonychinae is a paraphyletic (unnatural) grouping has been suggested by researchers such as Sales and Schultz, on the basis that genera such as Irritator and Angaturama (the two are possible synonyms) may represent intermediate forms between baryonychines and spinosaurines. As it is definitively known only from teeth, Siamosauruss exact position within the Spinosauridae is difficult to determine. In 2004, Brazilian palaeontologists Elaine Machado and Alexander Kellner suggested