Image: Heterodontosauridae evolution

Description: Evolution of key masticatory specializations among heterodontosaurids. A Heterodontosauridae B Simple-crowned heterodontosaurids C Heterodontosaurinae D Advanced heterodontosaurines E Abrictosaurus and Heterodontosaurus F Heterodontosaurus. Abbreviations: 1 arched inset diastema 2 heterodont dentition with caniniform teeth 3 cingular ectoloph 4 postcaniniform diastema 5 external mandibular fossa 6 lowered jaw articulation 7 mobile predentary articulating against saddle-shaped dentary articular surface 8 increased differential in crown size 9 arched alveolar margins in cheek dentition 10 asymmetrical enamel 11 hollow crown base.
Title: Heterodontosauridae evolution
Credit: Sereno PC (2012) Taxonomy, morphology, masticatory function and phylogeny of heterodontosaurid dinosaurs. ZooKeys 226: 1-225. doi:10.3897/zookeys.226.2840.
Author: Carol Abraczinskas, Paul C. Sereno
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