Allometric regression of Stegoceras validum frontoparietal widths against frontoparietal width.

Abbreviations: CI, 95% confidence interval; iso, isometry; +, positive allometry; −, negative allometry; W:n/prf, width between the nasal/prefrontal sutural contacts; W:prf/aso, width between the aso/pso supraorbital sutural contacts; W: aso/pso, width between anterior and posterior supraorbital sutural contacts; W:pso/po, width between the posterior supraorbital and postorbital sutural contacts; W:po/stf/sq, width between the contacts of postorbital suture and the supratemporal fenestrae or the squamosal suture if fenestrae are closed.