. The Canadian field-naturalist. Natural history; Sciences naturelles. 11. 8 S - c ? e e t VcrMbra a»<22*5 -•-0*1 22*0 Figure 5. Graphical depictions of vertebral disparity between CMN 2245 and CMN 2280. A, Differences between maxi- mum heights of vertebrae. The anterior thoracic vertebrae of CMN 2280 are consistently taller than those of CMN 2245. B, Differences between angles of neural spines. In the anterior thoracic region, the neural spines of CMN 2245 are angled further posteriorly than in CMN 2280. C. Differences between angles formed by transverse processes. The transverse processes
. The Canadian field-naturalist. Natural history; Sciences naturelles. 11. 8 S - c ? e e t VcrMbra a»<22*5 -•-0*1 22*0 Figure 5. Graphical depictions of vertebral disparity between CMN 2245 and CMN 2280. A, Differences between maxi- mum heights of vertebrae. The anterior thoracic vertebrae of CMN 2280 are consistently taller than those of CMN 2245. B, Differences between angles of neural spines. In the anterior thoracic region, the neural spines of CMN 2245 are angled further posteriorly than in CMN 2280. C. Differences between angles formed by transverse processes. The transverse processes of the cervical and anterior thoracic vertebrae of CMN 2280 are more erect than those of CMN 2245. D, Differences between transverse widths of centra. The cervical and anterior thoracic centra of CMN 2280 are consistently wider transversely than those of CMN 2245. Abbreviations: C. cer\ical venebra; T. tho- racic vertebra. tinangular epoccipital on its posterolateral comer; other parietal epoccipitals variable in number and degree of coossification with the parietal, but always much small- er. The lateral bar of the parietal completely encloses the parietal ; C. ntsselU was characterized as having a frill in which the posterior margin is "broadly arched on either side of [the] median emargination. Each side bears three low triangular, roughly equal- sized epoccipitals. The lateral ramus of the parietal is reduced and does not completely encircle the fenes- tra in all but one specimen, pennitting the squamosal to form a part of its lateral ; Under these amended diagnoses, CMN 2245 was retained within the hypo- digm of C. belli, but CMN 2280 was reassigned to C russelli. This distinction was challenged by Lehman (1998), who argued that the discrete characters used to distinguish C. belli from C. russelli actually represent end-members of a gradational spectrum of frill mor- phologies. In support of his argument, Lehman (1998: figure 9) figured s
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