In neoceratopsian dinosaurs, the centra, neural arches, and neural spines of several anteriormost cervical vertebrae are fused together to form a structure called the cervical bar (Langston, 1975) or syncervical (Ostrom and Wellnhofer, 1986). This structure characterizes all neoceratopsians (Dodson and Currie, 1990; Dodson et al., 2004; You and Dodson, 2004) for which the anterior cervicals are known, but it remains controversial how many vertebrae are fused together to produce this structure, namely, whether it consists of the first three (atlas through the third cervical) or four (atlas through the fourth cervical)...
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