Figure 49 in On the history, osteology, and systematic position of the Wealden (Hastings group) dinosaur Hypselospinus fittoni (Iguanodontia: Styracosterna)

Figure 49. The tree used for Sereno's (1998, 2005) stabilized ornithopod clade nomenclature. Is this a stable tree? Specific points of contention include the status of: Hypsilophodontidae (status disputed, widely regarded as paraphyletic – Butler et al., 2008), Iguanodontia (constituent taxa and topographical position of Tenontosaurus disputed – here), Camptosauridae (status and constituent taxa uncertain – McDonald, 2011), Probactrosaurus (topographical position disputed – Norman, 2002, 2004; Wang et al., 2010; Wu & Godefroit, 2012), Iguanodontidae (family status disputed and inconsistent constituent taxa – here, Norman, 2004; Wu & Godefroit, 2012), Hadrosauriformes (constituent taxa disputed – here, Norman, 2004; McDonald, Barrett & Chapman, 2010a), Hadrosauroidea (topographical position of Ouranosaurus disputed – Norman, 2004; McDonald, Barrett & Chapman, 2010a; Wang et al., 2010; Wu & Godefroit, 2012).