Phylogeny of iguanodontian dinosaurs and the evolution of quadrupedality Author Poole, Karen E. text Palaeontologia Electronica 2016 a 30 25 3 1 65 http://dx.doi.org/10.26879/702 journal article 10.26879/702 1094-8074 11063310 ANKYLOPOLLEXIA Sereno, 1986 Phylogenetic definition. The least inclusive clade containing Camptosaurus dispar ( Marsh, 1879 ) , Uteodon aphanoecetes ( Carpenter and Wilson 2008 ) , and Parasaurolophus walkeri Parks, 1922 (emended from Sereno, 1986 ). Unambiguous synapomorphies. Ankylopollexia is characterized by nine unambiguous synapomorphies: deltoid ridge of the scapula close to parallel to the long axis of the scapula (198.0), humerus with a well-developed deltopectoral crest (212.0), ulna with a flange on the proximal end that wraps around the lateral edge of the radius (219.1) some fusion of the carpals (227.1), manual digit I oriented at least 45 degrees from the antebrachial axis (232.1), metacarpal I short and block-like (233.1), ungual of manual digit I subconical (241.1), brevis fossa of ilium not well defined by a lateral lip (259.0), ossified epaxial and hypaxial tendons arranged in a double-layered lattice (323.1). Topology. This is a well-supported clade, with a Jackknife value of 35 and Bremer support of 6 in the parsimony analysis ( Figure 7 ), and a posterior probability of 0.91 in the Bayesian tree ( Figure 8 ). In both topologies, the most basally branching taxon is Uteodon , and Camptosaurus is recovered as the sister to Styracosterna. These two genera are the only non-styracosternan ankylopollexians.