New Basal Iguanodonts from the Cedar Mountain Formation of Utah and the Evolution of Thumb-Spiked Dinosaurs
Figure 20
Skull of Hippodraco scutodens.
(A) Skull of UMNH VP 20208, holotype of Hippodraco scutodens, in left lateral view. (B) Tracing of the skull of UMNH VP 20208 in left lateral view. Bones are white, matrix is grey, and empty spaces are black. Sutures and bone outlines are represented by solid black lines, ambiguous sutures by red dashed lines, and surficial features of the bones by green dashed lines. (C) Skull of UMNH VP 20208 in left medial view. (D) Tracing of the skull of UMNH VP 20208 in left medial view. Bones are white, matrix is grey, and empty spaces are black. Sutures and bone outlines are represented by solid black lines, ambiguous sutures by red dashed lines. Abbreviations: an, angular; aof, antorbital fossa; bc, braincase; bf, bone fragment; d, dentary; dlsd, dorsolateral shelf of dentary; dt, dentary tooth; fm, foramen magnum; itf, infratemporal fenestra; j, jugal; l, lacrimal; ld, left dentary; lf, left frontal; lj, left jugal; lmx, left maxilla; lna, left nasal; lpo, left postorbital; lpoc, left paroccipital process; lprf, left prefrontal; lpt, left pterygoid; lq, left quadrate; lsa, left surangular; mx, maxilla; orb, orbit; p, parietal; pmx, premaxilla; q, quadrate; qj, quadratojugal; rf, right frontal; rna, right nasal; rpo, right postorbital; rprf, right prefrontal; rsa, right surangular; sq, squamosal. Scale bars equal 10 cm.