Quantitative evidence for dimorphism suggests sexual selection in the maxillary caniniform process of Placerias hesternus
Fig 1
Composite skull of Placerias (UCMP 137369).
(A) photograph in left lateral view of a plaster cast based on the original composite reconstruction from Camp and Welles [29]; (B) the current version of the composite as revised in Cox [14]. Primary differences include shifting the maxilla and quadrate posteriorly in B, and the replacement of the maxillae in A with smaller elements. Abbreviations: mx, maxilla; pmx, premaxilla; q, quadrate. Arrow denotes anterior direction. Scale bar equals 10 cm.
